Logic in the Scriptures – A fortiori, Ad hominem and the Dilemma

The Principles and Methods of Christian Apologetics

The foundation of Christian theology and apologetics is propositional revelation alone, and if there is both written and oral revelation, written revelation is the foundation. All the content of apologetics, including the laws of logic, are found in propositional revelation. Apologetics rests on Scripture alone.

The methods of Christian apologetics may be divided into two parts, logical and rhetorical. The logical methods are sometimes stated, most often illustrated, by Jesus and Paul (and the other Biblical writers as well), as are the rhetorical methods. The logical methods include deduction in the forms of immediate inference, syllogism, and sorites; apagogic, sometimes called ad hominem, arguments (not to be confused with abusive ad hominem arguments) in which an opponent’s point of view is adopted for the purpose of demonstrating the logical absurdity of his view; dilemmas, and arguments a fortiori. The rhetorical devices include sarcasm, ridicule, kindness, courtesy, paradox, and questions. – The Apologetics of Jesus and Paul (by John W. Robbins)

Definitions

Ad hominen: An argument in which an opponent’s point of view is adopted for the purpose of demonstrating the logical absurdity of his view. Some forms of the ad hominen argument are: the Reductio Ad Absurdum and the apogogic argument. It is important that this is not confused with the abusive ad hominem which many erroneously equate with the ad hominem probably due to the fact that many reference books abridge, without warrant, the semantic range of the term “ad hominem” .

A fortiori: Arguing from the greater to the lesser or the lesser to the greater.

Rhetorical Question: A statement that is formulated as a question but that is not supposed to be answered. In logic, the meaning of the complete answer (a non-elliptical answer) to a rhetorical question is a proposition. (e.g. Is not the life more than meat, and the body than raiment? Answer: Yes, the life is more than meat and the body is more than raiment.)

Syllogism: Deductive reasoning in which a conclusion is derived from two premises; a major and a minor premise.

Dilemma: An argument requiring a choice between equally unfavorable options

Examples

No man can serve two masters: for either he will hate the one, and love the other; or else he will hold to the one, and despise the other. Ye cannot serve God and mammon. Therefore I say unto you, Take no thought for your life, what ye shall eat, or what ye shall drink; nor yet for your body, what ye shall put on. Is not the life more than meat, and the body than raiment? Behold the fowls of the air: for they sow not, neither do they reap, nor gather into barns; yet your heavenly Father feedeth them. Are ye not much better than they? Which of you by taking thought can add one cubit unto his stature? And why take ye thought for raiment? Consider the lilies of the field, how they grow; they toil not, neither do they spin: And yet I say unto you, That even Solomon in all his glory was not arrayed like one of these. Wherefore, if God so clothe the grass of the field, which to day is, and to morrow is cast into the oven, shall he not much more clothe you, O ye of little faith? Therefore take no thought, saying, What shall we eat? or, What shall we drink? or, Wherewithal shall we be clothed? (For after all these things do the Gentiles seek:) for your heavenly Father knoweth that ye have need of all these things. But seek ye first the kingdom of God, and his righteousness; and all these things shall be added unto you. Take therefore no thought for the morrow: for the morrow shall take thought for the things of itself. Sufficient unto the day is the evil thereof.
(Matthew 6:24-34)

-A fortiori, Rhetorical Device

Judge not, that ye be not judged. For with what judgment ye judge, ye shall be judged: and with what measure ye mete, it shall be measured to you again. And why beholdest thou the mote that is in thy brother’s eye, but considerest not the beam that is in thine own eye? Or how wilt thou say to thy brother, Let me pull out the mote out of thine eye; and, behold, a beam is in thine own eye? Thou hypocrite, first cast out the beam out of thine own eye; and then shalt thou see clearly to cast out the mote out of thy brother’s eye.
(Matthew 7:1-5)

-Ad hominem

If ye then, being evil, know how to give good gifts unto your children, how much more shall your Father which is in heaven give good things to them that ask him?
(Matthew 7:11)

-A fortiori

And, behold, they brought to him a man sick of the palsy, lying on a bed: and Jesus seeing their faith said unto the sick of the palsy; Son, be of good cheer; thy sins be forgiven thee. And, behold, certain of the scribes said within themselves, This man blasphemeth. And Jesus knowing their thoughts said, Wherefore think ye evil in your hearts? For whether is easier, to say, Thy sins be forgiven thee; or to say, Arise, and walk? But that ye may know that the Son of man hath power on earth to forgive sins, (then saith he to the sick of the palsy,) Arise, take up thy bed, and go unto thine house. And he arose, and departed to his house. But when the multitudes saw it, they marvelled, and glorified God, which had given such power unto men.
(Matthew 9:2-8)

-A fortiori, Ad hominem

What I tell you in darkness, that speak ye in light: and what ye hear in the ear, that preach ye upon the housetops. And fear not them which kill the body, but are not able to kill the soul: but rather fear him which is able to destroy both soul and body in hell. Are not two sparrows sold for a farthing? and one of them shall not fall on the ground without your Father. But the very hairs of your head are all numbered. Fear ye not therefore, ye are of more value than many sparrows.
(Matthew 10:27-31)

-A fortiori

And when he was departed thence, he went into their synagogue: And, behold, there was a man which had his hand withered. And they asked him, saying, Is it lawful to heal on the sabbath days? that they might accuse him. And he said unto them, What man shall there be among you, that shall have one sheep, and if it fall into a pit on the sabbath day, will he not lay hold on it, and lift it out? How much then is a man better than a sheep? Wherefore it is lawful to do well on the sabbath days. Then saith he to the man, Stretch forth thine hand. And he stretched it forth; and it was restored whole, like as the other. Then the Pharisees went out, and held a council against him, how they might destroy him.
(Matthew 12:9-14)

-A fortiori

Then Jesus went thence, and departed into the coasts of Tyre and Sidon. And, behold, a woman of Canaan came out of the same coasts, and cried unto him, saying, Have mercy on me, O Lord, thou Son of David; my daughter is grievously vexed with a devil. But he answered her not a word. And his disciples came and besought him, saying, Send her away; for she crieth after us. But he answered and said, I am not sent but unto the lost sheep of the house of Israel. Then came she and worshipped him, saying, Lord, help me. But he answered and said, It is not meet to take the children’s bread, and to cast it to dogs. And she said, Truth, Lord: yet the dogs eat of the crumbs which fall from their masters’ table. Then Jesus answered and said unto her, O woman, great is thy faith: be it unto thee even as thou wilt. And her daughter was made whole from that very hour.
(Matthew 15:21-28)

-Ad hominem

And, behold, one came and said unto him, Good Master, what good thing shall I do, that I may have eternal life? And he said unto him, Why callest thou me good? there is none good but one, that is, God: but if thou wilt enter into life, keep the commandments.
(Matthew 19:16-17)

-Ad hominem

And when he was come into the temple, the chief priests and the elders of the people came unto him as he was teaching, and said, By what authority doest thou these things? and who gave thee this authority? And Jesus answered and said unto them, I also will ask you one thing, which if ye tell me, I in like wise will tell you by what authority I do these things. The baptism of John, whence was it? from heaven, or of men? And they reasoned with themselves, saying, If we shall say, From heaven; he will say unto us, Why did ye not then believe him? But if we shall say, Of men; we fear the people; for all hold John as a prophet. And they answered Jesus, and said, We cannot tell. And he said unto them, Neither tell I you by what authority I do these things.
(Matthew 21:23-27)

-Dilemma

Then went the Pharisees, and took counsel how they might entangle him in his talk. And they sent out unto him their disciples with the Herodians, saying, Master, we know that thou art true, and teachest the way of God in truth, neither carest thou for any man: for thou regardest not the person of men. Tell us therefore, What thinkest thou? Is it lawful to give tribute unto Caesar, or not? But Jesus perceived their wickedness, and said, Why tempt ye me, ye hypocrites? Shew me the tribute money. And they brought unto him a penny. And he saith unto them, Whose is this image and superscription? They say unto him, Caesar’s. Then saith he unto them, Render therefore unto Caesar the things which are Caesar’s; and unto God the things that are God’s. When they had heard these words, they marvelled, and left him, and went their way.
(Matthew 22:15-22)

-Dilemma, Ad hominem

The same day came to him the Sadducees, which say that there is no resurrection, and asked him, Saying, Master, Moses said, If a man die, having no children, his brother shall marry his wife, and raise up seed unto his brother. Now there were with us seven brethren: and the first, when he had married a wife, deceased, and, having no issue, left his wife unto his brother: Likewise the second also, and the third, unto the seventh. And last of all the woman died also. Therefore in the resurrection whose wife shall she be of the seven? for they all had her. Jesus answered and said unto them, Ye do err, not knowing the scriptures, nor the power of God. For in the resurrection they neither marry, nor are given in marriage, but are as the angels of God in heaven. But as touching the resurrection of the dead, have ye not read that which was spoken unto you by God, saying, I am the God of Abraham, and the God of Isaac, and the God of Jacob? God is not the God of the dead, but of the living. And when the multitude heard this, they were astonished at his doctrine.
(Matthew 22:23-33)

-Contradiction, Reductio Ad Absurdum, Necessary inference (deduction)

While the Pharisees were gathered together, Jesus asked them, Saying, What think ye of Christ? whose son is he? They say unto him, The Son of David. He saith unto them, How then doth David in spirit call him Lord, saying, The LORD said unto my Lord, Sit thou on my right hand, till I make thine enemies thy footstool? If David then call him Lord, how is he his son? And no man was able to answer him a word, neither durst any man from that day forth ask him any more questions.
(Matthew 22:41-46)

-Ad hominem

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