Britannica Educational Publishing 
Ancient Philosophy [PDF ebook] 

Supplanting mythical explanations with those based on observation, early Greeks and some of their contemporaries sought to comprehend worldly phenomena in terms of more universal truths. This book introduces readers to the figures instrumental in implementing this refined way of thinking, including Socrates, Plato, and Aristotle. It also examines the effect of these thinkers on the major religions of the time, namely, Judaism and Christianity.