Baltasar Gracián was a writer and philosopher. He was a Jesuit, and was ordained in 1627. He is mostly known today for his wit, especially his collection of maxims known as The Art of Worldly Wisdom. Here is a small selection of the shorter maxims:
"Not believing others implies that you yourself are deceitful. The liar suffers twice: he neither believes nor is believed."
"The person who does not know how to put up with others should retire into himself, if indeed he can suffer even himself."
"When you counsel someone, you should appear to be reminding him of something he had forgotten, not of the light he was unable to see."
"Readiness is the mother of luck."
"Never open the door to a lesser evil, for other and greater ones invariably slink in after it."
"One should cultivate good habits of memory, for it is capable of making existence a Paradise or an Inferno."