“The essence of wisdom is to know when to be doing, and when it's useless even to try”
Source: The Last Enchantment
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Mary Stewart 7
English novelist 1916–2014Related quotes

“To know when to be generous and when firm—that is wisdom.”

Letter to Thomas Jefferson (17 January 1820). Often misquoted as "God is an essence that we know nothing of" and attached to a part of his 22 January 1825 letter to Thomas Jefferson.
1820s

“Wisdom is knowing when you can't be wise.”

“When you know that the snake is in you – that's wisdom.”
Other

“Parents probably don’t know that they are playing favorites even when they are doing it.”
Source: Time for the Stars (1956), Chapter 5, “The Party of the Second Part” (p. 54)