“The aphorism "as a man thinketh in his heart so is he" contains the secret of life.”
Source: Striking Thoughts (2000), p. 4; Lee here quotes Proverbs 23:7 "As he thinketh in his heart, so is he."
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Bruce Lee 193
Hong Kong-American actor, martial artist, philosopher and f… 1940–1973Related quotes
“An aphorism can contain only as much wisdom as overstatement will permit.”
Introduction to Unkempt Thoughts, St. Martin's Press (1962)

“601. The fatt man knoweth not what the leane thinketh.”
Jacula Prudentum (1651)

“The secret of success in life is for a man to be ready for his opportunity when it comes.”

The Art Eternal, New York Evening Mail (1918)
1910s

“A man's life is an appendix to his heart.”
Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 315.

The Thirteenth Revelation, Chapter 39

Source: Between Man and Man (1965), p. 150