Logic: An Introduction”
Pastor D Green

Sanctify them through thy truth: thy word is truth.” (John 17:17)

We live in a world in which logic is largely ignored and often misunderstood, but I submit to you that if one abondons logic, then the ability to distinguish good from evil and everything is permitted. And that is exactly what is happening in our world, as we witness the results of this rejection of logic – murder, war, abortion, homosexuality, transgenderism, even multiculturalism – all logical absurdities. The rejection of logic leads to the abandonment of morality!

We're told in this postmodern day that truth is relative. For you, 2+2=6 perhaps, but for me 2+2=4. Maybe Christianity is true for me, but Islam is true for you. Absolute truth is tossed out for relative truth, which makes bout as much sense as a square circle. But when logic is gone so is truth.

Notice our text. The word, “word” comes from the Greek logos which is where our word for logic comes from. Logic by definition is the study of correct and incorrect thinking. It is the way things fit together, or the way they ought to fit together. It is about the “chain or reasoning” rather than the specific evidences used within the argument. Logic detects and describes the necessary and unalterable laws of correct reasoning.

This article is but an introduction to logic. I would encourage the reader to study the further in the subject.

In the beginning was the Word, and the Word was with God, and the Word was God. The same was in the beginning with God. All things were made by him; and without him was not any thing made that was made. In him was life; and the life was the light of men.” (John 1:1-4)

There is no “human logic” to be contrasted with “Divine logic.” The laws of logic are the way God thinks. His ways are perfect. He makes no mistakes, makes no invalid arguments, comes to no invalid conclusions.

Notice Christ is called the Word here. Again, the Logos. The logic of God lights man; human logic is in the image of God. We who are God's people ought to think like God thinks – logically!

Let this mind be in you, which was also in Christ Jesus...” (Philippians 2:5)

The commandment here – is for us. It is not a suggestion, folks. We are commanded to think logically. What is the mind of Christ? We have it here in His Word.


And they shall turn away their ears from the truth, and shall be turned unto fables.” (II Timothy 4:4)

We must understand what it is that is going on today. When people tell us not to impose our “Christian” morality on them what they mean is that they do not want to hear impose our Christian logic on them. They prefer to be mindless.

Ever learning, and never able to come to the knowledge of the truth.” (II Timothy 3:7)

Education very often involves what to think but not how to think. This has been the failure (in part) of the modern public school movement. We have entire generations here who, are incapable of logical analysis. That's why children are so easily manipulated and deceived into believing “goo to you” evolution as well as other lies that are taught.

...which they that are unlearned and unstable wrest, as they do also the other scriptures, unto their own destruction.” (II Peter 3:16)

There are those who twist Scripture to their own destruction. This twisting involves errors in logic that comes from those who are unlearned and unstable.

That we henceforth be no more children, tossed to and fro, and carried about with every wind of doctrine, by the sleight of men, and cunning craftiness, whereby they lie in wait to deceive...” (Ephesians 4:14)

Without skill in logic we become like the children spoken of here. Of course it makes sense, if we reject the notion that there is any truth to be found, then our interest of getting the truth plunges rather rapidly.

So...while we must guard against such omnes we are also commanded to reason and dispute from the Scriptures with convincing and persuasive logical arguments. (Note: An argument is not to be confused with an emotionally heated exchange; rather it is a chain of statements (called propositions) in which the truth of one is asserted based on the others.

That we henceforth be no more children, tossed to and fro, and carried about with every wind of doctrine, by the sleight of men, and cunning craftiness, whereby they lie in wait to deceive.” I Peter 3:15

We are to be always ready to give an answer to every man who asks us the reason (literally the logical defense) for the hope that is in us. It is a sad commentary that many church going adults cannot adequately defend the basics of the faith, let alone defend the faith against the skeptics of our day!

I beseech you therefore, brethren, by the mercies of God, that ye present your bodies a living sacrifice, holy, acceptable unto God, which is your reasonable service.” (Romans 12:1)

Our service to God is to be logical or rational!


And ye shall know the truth, and the truth shall make you free.” (John 8:32)

We cannot obey the truth, without first knowing the truth. The Word of God is the truth upon which we must stand.

I have not written unto you because ye know not the truth, but because ye know it, and that no lie is of the truth.” (I John 2:21)

Herein is the law of non-contradiction. The law states that you cannot have “A” and “not A” at the same time and in the same relationship. Without the laws of logic reasoning would be impossible. The fact is to reject logic is to reject God. The atheist cannot account for the laws of logic , even though they must admit that they exist in order to do any rational thinking.

For I am the LORD, I change not...” (Malachi 3:6)

This is the law of identity, says that “A is A.” In other words, if any statement is true, then that statement is true....truth does not change.

And if by grace, then is it no more of works: otherwise grace is no more grace. But if it be of works, then is it no more grace: otherwise work is no more work.” (Romans 11:6)

The law of excluded middle says a statement is “either A or not A.” In other words, its either true or false, there is no alternative.


Consider some examples of uses of Christian logic, in the use of the word reasoning which comes from the Greek word we get our word dialectic from....its that branch of logic that teaches the rules and modes of reasoning:

And Paul, as his manner was, went in unto them, and three sabbath days reasoned with them out of the scriptures, Opening and alleging, that Christ must needs have suffered, and risen again from the dead; and that this Jesus, whom I preach unto you, is Christ. And some of them believed, and consorted with Paul and Silas; and of the devout Greeks a great multitude, and of the chief women not a few.” (Acts 17:2-4)

See also Acts 17:17; Acts 18:4; Acts 20:7, 9; Acts 24:24-25

It was customary for the Jews to reason from the Scriptures in their synagogues.

Reasoning included “fully opening” and “presenting” as well as “persuading.”

Paul reasoned from the Scriptures wherever he went.

The Christian faith is presented by reasoning and is spread by reasoning.

Knowing therefore the terror of the Lord, we persuade men; but we are made manifest unto God; and I trust also are made manifest in your consciences.” (II Corinthians 5:11)


Then Agrippa said unto Paul, Almost thou persuadest me to be a Christian.” (Acts 26:28)

We can and should know how to think logically. We should know how to defend the faith to give logical defense....to reason and persuade just like the Apostles. And we have been commanded to do so.

Yet we must remember our place. Nobody was ever persuaded into heaven, not by the Apostles. Not by you, not by me. It is not our job to convince the unbeliever nor can we. We can make a great case, but only the Holy Spirit can bring repentance. Do not be discouraged if you present the absolute best argument for the faith to your friends and your neighbors and yet they do not believe.

I have planted, Apollos watered; but God gave the increase. So then neither is he that planteth any thing, neither he that watereth; but God that giveth the increase.” (I Corinthians 3:6-7)

Let's be sure we are the absolute best waterboys and seed sowers we can be! Study logic, teach it to your family, preach it in the churches. And may God add the blessing!