The Habit of Well-Doing

Today is the memorial for St. Leo the Great. From his Sermon 90:

[I]n the Lord's prayer we say most devoutly, "Your Kingdom come, Your will be done as in heaven, so also on earth." For what else do we ask for in these words but that God may subdue those whom He has not yet subdued, and as in heaven He makes the angels ministers of His will, so also on earth He may make men? And in seeking this we love God, we love also our neighbour: and the love within us has but one Object, since we desire the bond-servant to serve and the Lord to have rule. This state of mind, therefore, beloved, from which earthly love is excluded, is strengthened by the habit of well-doing, because the conscience must needs be delighted at good deeds, and do willingly what it rejoices to have done. Thus it is that fasts are kept, alms freely given, justice maintained, frequent prayer resorted to, and the desires of individuals become the common wish of all. Labour fosters patience, gentleness extinguishes anger, loving-kindness treads down hatred, unclean desires are slain by holy aspirations, avarice is cast out by liberality, and burdensome wealth becomes the means of virtuous acts. But because the snares of the devil are not at rest even in such a state of things, most rightly at certain seasons of the year the renewal of our vigour is provided for: and now in particular, when one who is greedy of present good might boast himself over the clemency of the weather and the fertility of the land, and having stored his crops in great barns, might say to his soul, "you have much goods, eat and drink," let him take heed to the rebuke of the Divine voice, and hear it saying, "You fool, this night they require your soul of you, and the things which you have prepared, whose shall they be Luke 12:19-20?" This should be the wise man's most anxious consideration, in order that, as the days of this life are short and its span uncertain, death may never come upon him unawares, and that knowing himself mortal he may meet his end fully prepared.