“Take care of the feelings a person has for you: you’ll almost always realize what she’s worth, when it’s too late.”

The Trouble With Being Born (1973)
Source: The Trouble with Being Born

Source: The Serpent's Shadow

Original: Impara a prenderti cura della tua persona. Quando avrai bisogno di aiuto, gli altri avranno sempre da fare.
Source: prevale.net

Idle Thoughts of an Idle Fellow (1886)

1950s, Conquering Self-centeredness (1957)
Context: And there needs to be something in your life of a goddess of Nemesis which pulls you down when you get too high and pulls you up when you feel the sense of inadequacy and that is what religion at its best does. It keeps you to the point that you don’t feel like you are too low and you don’t feel like you are too high but you’ll maintain that type of balance. And you come to see that you’re an adjective, not a noun. It is only God that is a noun, you are a dependent clause not an independent clause. You come to see through great religion, somehow, there is only one being in this universe that can say “I am” unconditionally. We turn over to Genesis and we read of God saying, “I am that I am,” and that’s the only being that can say that. But man is a child of God and he must always say, “I am, because of.” And when you come to see that, you see that your existence is adjectival; it is dependent on something else. Your existence is dependent on the existence of a higher power and you can’t walk around the universe with arrogance. You can’t walk about the universe with a haughty spirit because you know that there is a God in this universe that you are dependent on.

Source: Short Answers to the Tough Questions: How to Answer the Questions Libertarians Are Often Asked, (2012), p. 137