St. Alphonsus de Liguori, How to Pray at All Times
Probably anyone who’s been Christian long enough to have listened to more than a few sermons has heard, time after time, that we should pray at all times. This is partly a generalisation of how every major Biblical figure seems to pray before and after doing just about anything of importance, as well as many specific instructions to pray frequently, but it’s stated most directly by St. Paul at 1 Thess.