Whoever thou art then that after thy baptism sufferest grievous trials, be not troubled thereat; for this thou receivedst arms, to fight, not to sit idle. God does not hold all trial from us; first, that we may feel that we are become stronger; secondly, that we may not be puffed up by the greatness of the gifts we have received; thirdly, that the Devil may have experience that we have entirely renounced him; fourthly, that by it we may be made stronger; fifthly, that we may receive a sign of the treasure entrusted to us; for the Devil would not come upon us to tempt us, did he not see us advanced to greater honours.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Hom. 13