“Once you can recognize the value of good states of mind, you can increase or foster them.”
The Dalai Lama's Book of Wisdom (2000).
Context: Within the body there are billions of different particles. Similarly, there are many different thoughts and a variety of states of mind. It is wise to take a close look into the world of your mind and to make the distinction between beneficial and harmful states of mind. Once you can recognize the value of good states of mind, you can increase or foster them.
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Tenzin Gyatso 112
spiritual leader of Tibet 1935Related quotes

Source: First Things First (1994), p. 113
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Google shows that the internet often attributes this statement to Einstein, but never with a source. It does not occur in any book in Google Books.
Misattributed

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Hitler's interview with Richard Breiting, 1931, published in Edouard Calic, ed., “First Interview with Hitler,4 May 1931,” Secret Conversations with Hitler: The Two Newly-Discovered 1931 Interviews, New York: John Day Co., 1971, pp. 36-37. Also published under the title Unmasked: Two Confidential Interviews with Hitler in 1931 published by Chatto & Windus in 1971
1930s

Excerpt from 2017 Personality Lecture 21. https://www.youtube.com/watch?v=j9U5IHQWSZc
Personality Lectures