Jesus said He was the truth.
He said He was “the way,” “the truth,” and “the life,” John 14:6. You’ll note the word “the” Jesus used before each of the nouns – it means exclusivity, there is no way to heaven than Jesus; there’s no truth except Jesus and His words; there’s no eternal life except through Jesus. If we want the way to heaven, we’ll have to look at Jesus. Likewise, if we want the truth, absolute truth, then we’ll have to listen to Jesus. And, if we want eternal life, we’ll have to have it the way Jesus offers it. This is a-b-s-o-l-u-t-e truth.

But how do we know this for sure?
Well, for one thing, Jesus said it was so, but the Bible helps our understanding of Jesus’ words. The Greek word for truth in the Bible is Aletheia. It’s the word Jesus used when He said He was the truth. When folks used this word back in New Testament days, it meant objective fact – the manifested, veritable essence of a matter (I got this info from Vine’s New Testament Dictionary for “truth,” G225).
Romans 9:1 – Paul says he is telling the truth, the absolute truth of a thing.
Galatians 2:5 – Paul speaks of the gospel’s truth, of what it says and what it means.
Romans 15:8 – Paul speaks of the veracity of God’s existence.
John 14:6 – “truth” means absolute truth of getting home to heaven.

These are but a few examples of how Aletheia is used in the New Testament.

So then, what are we to do about this truth?
If one believes in the truth of God’s existence and all that entails, then we ought to follow that truth wherever it leads. The miracles Jesus performed are true. The words He expressed are actual – one can’t successfully argue against them. And, if the word is true, then Jesus came forth from the grave. His resurrection is true. And when Jesus said some would rise to be with Him for, they have done godly deeds, while others rise to judgment – because they did not listen to Him, this is also true, John 5:28-29. Therefore, following the truth means whatever Jesus said is for us to do or understand. If He said repent, then we must repent of our sins. And if He said we are to confess His name before men, then we are to do just that. And if He said we are to be baptized to have our sins washed away, then we are definitely to do just that. Finally, Jesus wants us to live holy lives, loving others.

Heaven is truth, too.
John 14:2-3. Jesus prepares a home for us. He says we can be with Him, and He will come again to take us to our eternal home. Our eternal home is heaven. See Revelation 21:4 and 22:1-5. Our Father is in heaven, as is Jesus and the Holy Spirit. Heaven is for those who know Jesus is the only way there, who listen to His words, for He is the only one offering heavenly, spiritual, life.