13.

As to the remark in your letter that you are now compelled to believe that I refuse to visit Carthage for fear lest you should be seen there by me, you rather compel me by these words to state explicitly the reasons of my absence. One reason is, that the labour which I am obliged to undergo in that city, and which I could not describe without adding as much again to the length of this letter, is more than I am able now to bear, since, in addition to my infirmities peculiar to myself, which are known to all my more intimate friends, I am burdened with an infirmity common to the human family, namely, the weakness of old age. The other reason is, that, in so far as leisure is granted me from the work imperatively demanded by the Church, which my office specially binds me to serve, I have resolved to devote the time entirely, if the Lord will, to the labour of studies pertaining to ecclesiastical learning; in doing which I think that I may, if it please the mercy of God, be of some service even to future generations.