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 1. From ancient philosophers, I would name Socrates, Plato, and Marcus Aurelius. 

2. From modern times - Schopenhauer, Nietzsche, Freud, and Karl Young.

3. From Eastern - Buddha, Lao Tzu, and Suzuki. 

4. From Eastern European tradition - Ukrainian Григорій Сковорода - 300 years old just today! - Russian Николай Бердяев, and poet-philosopher Заболоцкий. 

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From my childhood - my best dog Kashtan taught me how to be a friend.