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Pythagoras
Pythagoras (l.c. 571 to c. 497 BCE) was a Greek philosopher whose teachings emphasized the immortality and transmigration of the soul (reincarnation), virtuous, humane behavior toward all living things, and the concept of "number" as truth...

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Heraclitus: Life Is Flux
Heraclitus of Ephesus (l. c. 500 BCE) famously claimed that “life is flux” and, although he seems to have thought this observation would be clear to all, people have continued to resist change from his time to the present day. Heraclitus...

Definition
Parmenides
Parmenides (l.c. 485 BCE) of Elea was a Greek philosopher from the colony of Elea in southern Italy. He is considered among the most important of the Pre-Socratic philosophers who initiated philosophic inquiry in Greece beginning with Thales...

Definition
Anaximander
Anaximander of Miletus (l. c. 610 - c. 546 BCE) was one of the early Pre-Socratic Philosophers who lay the foundation for the deveopment of Western Philosophy. He was a student of Thales of Miletus (l. c. 585 BCE), recognized as the first...

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Protagoras
Protagoras of Abdera (l. c. 485-415 BCE) is considered the greatest of the Sophists of ancient Greece and the first philosopher in the West to promote Subjectivism, arguing that interpretation of any given experience, or anything whatsoever...

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Xenophanes of Colophon
Xenophanes of Colophon (l. c. 570 to c. 478 BCE) was a Greek philosopher born 50 miles north of Miletus, a city famed for the birth of philosophy and home to the first Western philosopher, Thales of Miletus (l. c. 585 BCE). He is considered...

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Anaximenes
Anaximenes of Miletus (l. c. 546 BCE) was a younger contemporary of Anaximander and generally regarded as his student. Known as the Third Philosopher of the Milesian School after Thales (l. c. 585 BCE) and Anaximander (l. c. 610 - c. 546...

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Critias
Critias (l. c. 460-403 BCE) was an Athenian politician, poet, and playwright, one of Socrates' followers, Plato's second cousin, a leading member of the Thirty Tyrants of Athens, and leader of the oligarchy they established. He is referenced...

Definition
Melissus of Samos
Melissus of Samos (l. c. 5th century BCE) was a Greek philosopher of the Eleatic School, considered the third great proponent of that philosophy's claim that reality is One, after Parmenides (l. c. 485 BCE) and Zeno of Elea (l. c. 465 BCE...

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Gorgias' On Nature (On the Non-Existent)
Gorgias of Leontini (l. c. 427 BCE) was a famous Greek Sophist who claimed that nothing exists and, even if it does, its nature cannot be understood and, even if it could be, one is not able to communicate that understanding to another person...