The dying to self day after day demanded of us by the Gospels. This from Edward Feser:
For Aquinas, we are not here for ourselves, but for the glory of God, and precisely because this is an end set for us by nature, it is in him alone that we can find our true happiness. And it must be emphasized that, as with other themes we’ve explored in this book, he takes this conclusion to be a matter, not of faith, but of reason itself. Therein lies the sting of Aquinas’s challenge to modernity.