Jesus said unto him,
I am the way, the truth, and the life: no man comes unto the Father, but by me.
All Commentaries on John 14:6 Go To John 14
Irenaeus of Lyons
AD 202
But when this name of six letters was manifested (the person bearing it clothing Himself in flesh, that He might come under the apprehension of man's senses, and having in Himself these six and twenty-four letters), then, becoming acquainted with Him, they ceased from their ignorance, and passed from death unto life, this name serving as their guide to the Father of truth.
Since, therefore, the tradition from the apostles does thus exist in the Church, and is permanent among us, let us revert to the Scrip-rural proof furnished by those apostles who did also write the Gospel, in which they recorded the doctrine regarding God, pointing out that our Lord Jesus Christ is the truth.
If ye had known Me, ye would have known My Father also: and from henceforth ye have both known Him, and have seen Him."