11 If then you desire joy, seek not after riches, nor bodily health, nor glory, nor power, nor luxury, nor sumptuous tables, nor vestures of silk, nor costly lands, nor houses splendid and conspicuous, nor any thing else of that kind; but pursue that spiritual wisdom which is according to God, and take hold of virtue; and then nought of the things which are present, or which are expected, will be able to sadden you. Why do I say to sadden? Verily, the things that make others sad, will prove to you an accession of pleasure. For scourges, and death, and losses, and slanders, and the being evil entreated, and all such things, when they are brought upon us for God's sake, and spring from this root, will bring into our souls much pleasure. For no one will be able to make us miserable, if we do not make ourselves such; nor, on the other hand, blessed, if we do not make ourselves such, following up the grace of God.
Source: Homilies on the Statues (New Advent)