John 8:12

Then spake Jesus again Addressing himself to his disciples and the multitude; I am the light of the world It was with singular propriety that our Lord spake thus, after the wonderful display which he had just made, by the above-mentioned remarkable decision, of his wisdom and knowledge, as well as of his power and goodness. He probably alluded to Malachi 4:2, where the Messiah is foretold under the name of the Sun of righteousness; or to the bright shining of the sun that morning. As if he had said, I am the spiritual Sun, that dispels the darkness of ignorance and superstition, with which the minds of men are overcast; for by my doctrine and example I show clearly everywhere the will of God and the way of salvation: and I never leave those in darkness who walk by my light, as the sun leaves travellers when he sets, and occasions the darkness of the night. For he that followeth me That adheres to, and continues to learn of me; that imitates my example, and governs himself by the dictates of my word and Spirit; shall not walk in darkness In ignorance or error, sin or misery; but shall have the light of life He that closely, humbly, steadily follows me, shall have the divine light continually shining upon him, diffusing over his soul knowledge, holiness, and joy, till he is guided by it to life everlasting.