LIII. To the Soldiers of Christ.
When you have given your name to the warfare, you are held by a bridle. Therefore begin to put away your former doings. Shun luxuries, since labour is threatening arms. With all your virtue you must obey the king's command, if you wish to attain the last times in gladness. He is a good soldier, always wait for things to be enjoyed. Be unwilling to flatter yourself; absolutely put away sloth, that you may daily be ready for what is set before you. Be careful beforehand; in the morning revisit the standards. When you see the war, take the nearest contest. This is the king's glory, to see the soldiery prepared. The king is present; desire that you may fight beyond his hope. He makes ready gifts. He gladly looks for the victory, and assigns you to be a fit follower. Be unwilling to spare yourself besides for Belial; be rather diligent, that he may give fame for your death.
Source: Writings (New Advent)