sufficient quotes, aphorisms, statements, say
Francois de La Rochefoucauld Nothing is impossible; there are ways that lead to everything, and if we had sufficient will we should always have sufficient means. It is often merely for an excuse that we say things are impossible.
The Chronicles of Narnia by C. S. Lewis "Welcome, Prince," said Aslan. "Do you feel yourself sufficient to take up the Kingship of Narnia?"
"I — I don't think I do, Sir," said Caspian. "I'm only a kid."
"Good," said Aslan. "If you had felt yourself sufficient, it would have been a proof that you were not."