WHAT IS TRUTH?

John 18:38 Pilate saith unto him, What is truth? And when he had said this, he went out again unto the Jews, and saith unto them, I find in him no fault at all.

Matthew Henry:

What is truth? 

When we search the Scriptures, and attend the ministry of the word, it must be with this inquiry, What is truth? and with this prayer, Lead me in thy truth; into all truth. 
But many put this question, who have not patience to preserve in their search after truth; or not humility enough to receive it. 

By this solemn declaration of Christ’s innocence, it appears, that though the Lord Jesus was treated as the worst of evil-doers, he never deserved such treatment. But it unfolds the design of his death; that he died as a Sacrifice for our sins. 

Pilate was willing to please all sides; and was governed more by worldly wisdom than by the rules of justice. Sin is a robber, yet is foolishly chosen by many rather than Christ, who would truly enrich us. Let us endeavour to make our accusers ashamed as Christ did; and let us beware of crucifying Christ afresh.

Barnes:

What is truth?

This question had long agitated the world. It was the great subject of inquiry in all the schools of the Greeks. Different sects of philosophers had held different opinions, and Pilate now, in derision, asked him, whom he esteemed an ignorant fanatic, whether he could solve this long-agitated question. He might have had an answer. If he had patiently waited in sincerity, Jesus would have told him what it was. 

Thousands ask the question in the same way. They have a fixed contempt for the Bible; they deride the instructions of religion; they are unwilling to investigate and to wait at the gates of wisdom; and hence, like Pilate, they remain ignorant of the great Source of truth, and die in darkness and in error. 

All might find truth if they would seek it; none ever will find it if they do not apply for it to the great source of light the God of truth, and seek it patiently in the way in which he has chosen to communicate it to mankind. 

How highly should we prize the Bible! And how patiently and prayerfully should we search the Scriptures, that we may not err and die forever!

Gill:

What is truth?

Many things might be observed in answer to this question, as that there is… 

the truth and faithfulness of God in his word and promises; 

the truth of grace in the hearts of his people; 

Jesus Christ himself is truth, he is true God, and true man; 

the truth of all covenant transactions, of all types, promises, and prophecies; 
whatever he said and taught was truth, and the truth of all doctrine comes from him. 

The Gospel is truth in general; it comes from the God of truth; lies in the Scriptures of truth; 

Christ, who is truth itself, is the substance of it; 

the Spirit of truth has an hand in it, leads into it, and makes it effectual; 

the whole of it is true, and every particular doctrine of it; as the manifestation of the Son of God in human nature, his coming into the world to save the chief of sinners, justification by his righteousness, pardon by his blood, atonement by his sacrifice, the resurrection of the dead.

John 14:6 Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me. 

Acts 4:12 Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved. 

1 Timothy 2:5 For there is one God, and one mediator between God and men, the man Christ Jesus;