The Sinner's Guide by Venerable Louis of Granada

Two things, Christian reader, particularly excite the will of man to good. A principle of justice is one, the other the profit we may derive therefrom. All wise men, therefore, agree that justice and profit are the two most powerful inducements to move our wills to any undertaking. Now, though men seek profit more frequently than justice, yet justice is in itself more powerful; for, as Aristotle teaches, no worldly advantage can equal the excellence of virtue, nor is any loss so great that a wise man should not suffer it rather than yield to vice.