St. Ambrose on Fortitude

FORTITUDE of soul, then, is not an unimportant thing, nor is it cut off from the other virtues, for it wages war in conjunction with the virtues, and alone defends the beauty of all the virtues, and guards their powers of discernment, and fights against all vices with implacable hate.

It is unconquerable as regards labours, brave to endure dangers, stern as against pleasures, hardened against allurements, to which it knows not how to lend an ear, nor, so to speak, to give a greeting. It cares not for money, and flies from avarice as from a plague that destroys all virtue.