It is fitting, brethren, that as far as possible we should treat of the text of Holy Scripture, and especially of the Holy Gospel, without omitting any portion, that both we ourselves may derive nourishment according to our capacity, and may minister to you from that source from which we have been nourished. Last Lord's day, we remember, we treated of the first section; that is, “In the beginning was the Word, and the Word was with God, and the Word was God. The same was in the beginning with God.
All things were made by Him; and without Him was nothing made. That which was made, in Him is life; and the life was the light of men. And the light shines in darkness; and the darkness comprehended it not.” So far, I believe, had I advanced in the treatment of the passage: let all who were present recall what was then said; and those of you who were not present, believe me and those who chose to be present. Now therefore—because we cannot always be repeating everything, out of justice to those who desire to hear what follows, and because repetition of the former thought is a burden to them and deprives them of what succeeds—let those who were absent on the former occasion refrain from demanding repetition, but, together with those who were here, listen to the present exposition.
Source: Tractates on the Gospel of John (New Advent)