For perhaps He delays purposely, to redouble your earnestness and coming to him, and that you may know what the gift of God is, and may anxiously guard what is given. For whatever a man acquires with much pains he strives to keep safe, lest with the loss of that he should lose his labour likewise.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Const. Mon. c. 1.