The light shines in the darkness, and the darkness has not overcome it.
5. And the light shineth in darkness. It might be objected, that the passages of Scripture in which men are called blind are so numerous and that the blindness for which they are condemned is but too well known. For in all their reasoning faculties they miserably fail.
Austin says (de Civitate Dei, lib. 10, cap. 29) that his friend Simplicius told him he had heard a Platonic philosopher say that these first verses of St. John's gospel were worthy to be written in letters of gold. The learned Francis Junius, in the account he gives of his own life, tells how he was in his youth infected with loose notions in religion...
Commenting on John 1:1-5
And the light shineth in darkness,.... Which, through sin, came upon the minds of men; who are naturally in the dark about the nature and perfections of God; about sin, and the consequences of it; about Christ, and salvation by him; about the Spirit of God, and his work upon the soul; and about the Scriptures of truth, and the doctrines of the Gospel.