“Do not indulge in dreams of having what you have not, but reckon up the chief of the blessings you do possess, and then thankfully remember how you would crave for them if they were not yours.”

Delusion for a Dragon Slayer (1966)
Context: "Heaven is what you mix all the days of your life, but you call it dreams. You have one chance to buy your Heaven with all the intents and ethics of your life. That is why everyone considers Heaven such a lovely place. Because it is dreams, special dreams, in which you exist. What you have to do is live up to them."
"I—" started Griffin, but the wizard cut him off with a blink.
"No, listen, please, because after this, all the magic stops, and you have to do it alone.
“You create your own Heaven, and you have the opportunity to live in it, but you have to do it on your own terms, the highest terms of which you are capable. So sail this ship through the straits, navigate the shoals, find the island, overcome the foam-devil that guards the girl, win her love, and you’ve played the game on your own terms."

Source: Meditations

That is the golden rule. Do unto others, what you would have them do to you. That is the golden rule, and it is not very complicated.
2010s, 2015, Liberty University Speech (14 September 2015)

Source: Meditations in Wall Street (1940), p. 81

Original: (it) Ogniqualvolta dovessi dubitare di ciò che stai facendo, ricorda di amare ciò che hai. Ricorda di amare ciò che fai. Ricorda di amare ciò che dai.
Source: prevale.net

Illusions : The Adventures of a Reluctant Messiah (1977)
Variant: All the people, all the events in your life are put there for a reason. What you choose to do with them is up to you

Young Americans
Song lyrics, Young Americans (1975)

[Basedow, John, Fitness Made Simple : The Power to Change Your Body, the Power to Change Your Life, 2008, McGraw-Hill, New York, 0071497080, 8]

Knowing Yourself: The True in the False (1996)