Knowing Yourself: The True in the False (1996)
“Whenever we judge others, it emanates from our fear, and separation. When you feel separate from everything around you, then you judge it. When you are connected to something, there is no need to judge.”
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Ralph Smart 339
Related quotes

“For books continue each other, in spite of our habit of judging them separately.”
Source: A Room of One's Own and Three Guineas
“When you judge others, you do not define them, you define yourself”

“You can judge your age by the amount of pain you feel when you come into contact with a new idea.”
John Nuveen, as quoted in The Leadership Secrets of Billy Graham (2005) by Marshall Shelley, p. 303
Misattributed

Variant: That there are no random acts. That we are all connected. That you can no more separate on life from another than you can separate a breeze from the wind.
Source: The Five People You Meet in Heaven (2003)
Context: "All the people you meet here have one thing to teach you." Eddie was skeptical. His fists stayed clenched. "What?" he said. "That there are no random acts. That we are all connected. That you can no more separate one life from another than you can separate a breeze from the wind."

Press conference https://grabien.com/story.php?id=61634, Las Vegas, Nevada (4 August 2016)
Presidential campaign (April 12, 2015 – 2016)

“When you judge another, you do not define them, you define yourself.”

Not a Kerouac quote, but by the Indian spiritual leader, Sri Chinmoy (1931-2007).
Misattributed