John 8:14

Jesus answered and said unto them, Even if I bear witness of myself, my witness is true; for I know whence I came, and whither I go; but ye know not whence I come, or whither I go.

Back at the pool of Bethesda (John 5:31), Christ had waived momentarily his right of bearing witness of himself; but, finally, light cannot do otherwise than bear its own witness. How fortunate are we that Christ did bear witness of himself in the most dogmatic and convincing manner. If he had not done so, it would have cast a cloud over the faith in Christ.

Whence I came ... whither I go ... None except Christ could bear witness to such things as these. He came from God to walk among the shameful dwellings of men; and he would go, when his mission was ended, back to the right hand of the majesty on high. In such areas as these, his foes were totally ignorant. Reynolds commented:

The whole of our Christian verities turns upon the consciousness by Jesus of that which lay before and after that human life of his. He embraced the two eternities in his inward self-consciousness. That "whence" and that "whither," with all their sublimity and solemnity, give adequate evidence and sufficient weight to his personal claim to be the Light of the world.[3]