Truth as Non-concealment

Translated into English as "truth", alethia means "nonconcealment." It means a thing as it really is. It is used in philosophy to denote true being. From the fifth century before Christ philosophers have debated how truth can be known, or in more recent times whether truth can be known. The main idea has been that truth exists somewhere but it is hidden and what we have is impartial or a pale imitation.

From Plato onward we have arguments that there is truth but how can it be known. Struggling with the notion that truth is located not in our world but in a world of ideas hidden from our senses became their life's work.
The word alethia came to mean "genuine reality." True being must be a divine reality. "Many circles no longer believe that this can be known though thought but only by ecstasy or revelation, i.e., from the divine sphere. Alethia thus comes into relation with dynamis (power), and then with gnosis (knowledge) that it mediates, and zoe (life) and phos (light) that it gives. Similar connections are made with pneuma (spirit) and nous (mind) insofar as these concepts describe the divine sphere.

In John 14.6, Jesus speaks the words, I am the way, the truth and the life." The Gospel of John especially uses it as a reality possible for human existence that is only granted through faith through revelation by the Word of God.

For me, learning about truth as non-concealment" was something like discovery, an epiphany. Something was revealed. Different writers of the New testament say that Jesus spoke the truth, John says that and more, but the Word says even more than that. Not only that his words bring a revelation of truth, the revelation is he is the truth and Truth is no longer concealed, but revealed.

We begin to see that this is not just a knowledge that comes through true statements but an encounter with the Christ, who is the truth. God himself is disclosed, the incarnate word full of grace and truth (Jn 1:14,17).

True worship is determined by God's reality, not ours, as His Spirit is given to worship in truth. After His crucifixion, the gift of His Spirit of Truth insures His community ongoing revelation, expressed in right doctrine and having a right way of life so that they become known as fellow workers in the truth (3 John 8, loving one another in truth and united in truth and love (2 John 1 ff.)

God himself is disclosed. True being is no longer hidden.

-see the Theological Dictionary of the New Testament, G. Kittel, editor.