“We are shaped by our thoughts; we become what we think. When the mind is pure, joy follows like a shadow that never leaves.”
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Gautama Buddha 121
philosopher, reformer and the founder of Buddhism -563–-483 BCRelated quotes

“We become what we behold. We shape our tools, and thereafter our tools shape us.”

Attributed to R.D. Lang in: Jack Lee Seymour, Margaret Ann Crain, Joseph V. Crockett (1993) Educating Christians. p. 53

“We are what we think.
All that we are arises with our thoughts.
With our thoughts we make the world.”
As rendered by T. Byrom (1993), Shambhala Publications.
There is no quote from the Pali Canon that matches up with any of these. The closest quote to this is in the Majjhima Nikaya 19:
"Whatever a monk keeps pursuing with his thinking & pondering, that becomes the inclination of his awareness. If a monk keeps pursuing thinking imbued with sensuality, abandoning thinking imbued with renunciation, his mind is bent by that thinking imbued with sensuality. If a monk keeps pursuing thinking imbued with ill will, abandoning thinking imbued with non-ill will, his mind is bent by that thinking imbued with ill will. If a monk keeps pursuing thinking imbued with harmfulness, abandoning thinking imbued with harmlessness, his mind is bent by that thinking imbued with harmfulness." Sources: http://www.accesstoinsight.org/tipitaka/mn/mn.019.than.html
Misattributed

Translation J. L. Austin (Oxford, 1950) as quoted by Stephen Toulmin, Human Understanding: The Collective Use and Evolution of Concepts (1972) Vol. 1, p. 56.
Grundgesetze der Arithmetik, 1893 and 1903

February, 1932
Diary entries (1914 - 1974)
Source: Fire: From A Journal of Love - The Unexpurgated Diary of Anaïs Nin