Source: How to Win Friends and Influence People
“Is there a difference between happiness and inner peace? Yes. Happiness depends on conditions being perceived as positive; inner peace does not.”
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Eckhart Tolle 251
German writer 1948Related quotes

Nobel lecture (1989)
Context: Inner peace is the key: if you have inner peace, the external problems do not affect your deep sense of peace and tranquility. In that state of mind you can deal with situations with calmness and reason, while keeping your inner happiness. That is very important. Without this inner peace, no matter how comfortable your life is materially, you may still be worried, disturbed or unhappy because of circumstances.
“Without inner peace, outer peace is impossible.”
Transform Your Life: A Blissful Journey (2001) ISBN 9780978906740

“Being happy, a state of mind of inner well-being that terribly disturbs those who are not.”
Original: (it) L'esser felice, uno stato d'animo di benessere interiore che disturba terribilmente chi non lo è.
Source: prevale.net

“No price is too great to pay for inner peace.”
Words of Wisdom (2010)

Session 337, Page 16
The Early Sessions: Sessions 1-42, 1997, The Early Sessions: Book 8