“I am not afraid of a person who knows 10000 kicks. But I am afraid of a person who knows one kick but practices it for 10000 times.”
Source: Bruce Lee — Wisdom for the Way
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Bruce Lee 193
Hong Kong-American actor, martial artist, philosopher and f… 1940–1973Related quotes

“I am mystified. I know only one person who voted for Nixon.”
Attributed to Kael after the 1972 American Presidential election, which Nixon won easily. This misquote is presumably based on "I live in a rather special world." above, but there is no evidence that Kael was mystified or surprised by that election's outcome.
Misattributed

“Although personal calling I sense—who am I? even if I am, I don't know.”
“If I Am,” p. 7
Circling: 1978-1987 (1993), Sequence: “Recircling”

As quoted in Massoud's Smile https://pbs.twimg.com/media/FBR8V8YWEAI9OWu?format=jpg, by Hiromi Nagakura

“Pitiful is the person who is afraid of taking risks.”
By The River Piedra I Sat Down and Wept (1994)

“The most dangerous kind of person… is one who is afraid of his own shadow.”
Source: A Scanner Darkly