Attributed to Siddhartha Gautama, the Buddha
«Peace comes from within. Do not seek it without.»
Misattributed
Verdict
It is not in Siddhartha Gautama, the Buddha's work
It has not been located in the Pali canon or in the Mahayana texts consulted; it circulates in quotation collections with no reference to any text. Its origin could not be traced.
What they did say
Verified words of Siddhartha Gautama, the Buddha
«All that we are is the result of what we have thought: it is founded on our thoughts, it is made up of our thoughts. If a man speaks or acts with an evil thought, pain follows him, as the wheel follows the foot of the ox that draws the carriage.»
Dhammapada 1 (trad. inglesa de Max Müller, SBE X, 1881; texto pali en SuttaCentral)
«For hatred does not cease by hatred at any time: hatred ceases by love—this is an old rule.»
Dhammapada 5 (trad. inglesa de Max Müller, SBE X, 1881)
«Not to commit any sin, to do good, and to purify one's mind, that is the teaching of (all) the Awakened.»
Dhammapada 183 (trad. inglesa de Max Müller, SBE X, 1881)