Many, on the other hand, fabricate a sort of sanctity according to their own inclinations; some, inclined to melancholy, make sanctity consist in living in seclusion; others, of a busy temperament, in preaching and in making up quarrels; some, of an austere nature, in penitential inflictions and macerations; others, who are naturally generous, in distributing alms; some in saying many vocal prayers; others in visiting sanctuaries; and all their sanctity consists in such or the like practices. External acts are the fruit of the love of Jesus Christ; but true love itself consists in a complete conformity to the will of God; and as a consequence of this, in deny ing ourselves and in preferring what is most pleasing to God, and solely because he deserves it.
--St. Alphonsus Liguori, The Holy Eucharist