In John 6 Jesus proclaims He is the bread of LIFE.

   44 I am that bread of LIFE.

   45 Your fathers did eat manna in the wilderness, and are dead.

   51 I am the living bread that came down from heaven; if any man eat of this bread, he shall live forever; and the bread that I will give is m flesh, which I will give for the LIFE of the world.

Later in John 14:6

   . . . I AM the Way, the Truth, and the LIFE.

By the witness of these two verses, among many others, we reckon Jesus proclaiming that HE (the Divine person and very God) is THE WHO. . . of LIFE.

Yet when Jesus, the Truth, stood before Pilate, the Truth said, in John 18:

37 Pilate, therefore, said unto HIM, Art THOU a king, then? Jesus answered. Thou sayest that I am a king. To this end was I born, and for the cause came I into the world, that I should bear witness unto the TRUTH.  Everyone that is of the TRUTH HEARETH MY VOICE.

   38  Pilate saith unto him, WHAT is truth?. . .

When Jesus testified in John 6:45 that Your fathers did eat manna . . . and are dead. He referred to the account in the Old Testament in Exodus 16:15

And when the children of Israel SAW it, they said one to another, It is manna, for they knew not WHAT it was.  And Moses SAID unto them, This is the bread which the Lord hath given you to eat.

According to Strong’s Concordance manna means ‘WHAT IS IT’?

Both Pilate and the children of Israel were concerned with WHAT they were seeing, rather than the WHO that was speaking.

So we are back in the garden, again.  For we find we are dealing with the Tree of Knowledge (WHAT) of good and evil and the Tree of Life (Jesus, the speaking WHO), guarded by a flaming sword of fire.  The fruit of one leads to death in our efforts to be like God, the other requires a death/cross that leads to eternal resurrected LIFE by faith in Christ Jesus.