“You must also have a sense of when to stop.”
Part I, Chapter 4, Calculation, p. 51
2000s, How Life Imitates Chess (2007)
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Garry Kasparov 61
former chess world champion 1963Related quotes

Enrico Bombieri, cited in: Leonard F. Koziol (2014), The Myth of Executive Functioning. p. 1
“Must stop. This ink is amazing, it really doesn't smear, even when you cry on it”
Source: Code Name Verity

Mr. Citizen, Harry Truman (1960)
Tommy Lee Wallace on Crafting His Miniseries Masterpiece, IT https://dailydead.com/stephen-king-week-tommy-lee-wallace-on-crafting-his-miniseries-masterpiece-it/ (October 27, 2015)

“When you can stop you don't want to, and when you want to stop, you can't…”
Source: Candy
The Spiral Dance: A Rebirth of the Ancient Religion of the Goddess (1979)
Context: This is the stillness behind motion, when time itself stops; the center is also the circumference of all. We are awake in the night. We turn the Wheel to bring the light. We call the sun from the womb of night. Blessed Be!

“You don't stop laughing when you grow old, you grow old when you stop laughing.”
Variant: We don't stop playing because we grow old; we grow old because we stop playing.