Best philosophers and self improvement gurus:
Buddha
Vivekananda
Lao Tzu
Joseph Campbell
Viktor Frankl
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Jocko Willink
Brian Tracy
Leo of actualised
Tony Robbins
Noam Chomsky
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Jordan Peterson
Balthasar Gracian
Aristotle
Sun Tzu
Seneca the younger
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Socrates
Epicurus
John Taylor Gatto
Steve Pavlina
Edmund Burke
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William James
Ryan Holiday
Yogananda
Napoleon (well, good for quotes....)
Ralph Waldo Emerson
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Elliot Hulse
Will Durant (OK, more of a historian...)
Tim Ferris
Benjamin Franklin
Thomas Jefferson
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Saddhguru
Zoroaster
Voltaire
Diogenese
(Newman K Lin...)
Find quotes from most of these on azquotes.com