Everyone Should Study At Least Enough Philosophy

Truly, Men Make Too Little Use Of Their Lives; And So It Is No Wonder That The World Should Still Be In Such A Poor Way.

Doubt Must Be No More Than Vigilance, Otherwise It Can Become Dangerous.

Some People Feel With Their Heads And Think With Their Hearts.

The Sure Conviction That We Could If We Wanted To Is The Reason So Many Good Minds Are Idle.

The Natural Scientists Of The Previous Age Knew Less Than We Do And Believed They Were Very Close To The Goal: We Have Taken Very Great Steps In Its Direction And Now Discover We Are Still Very Far Away From It. With The Most Rational Philosophers An Increase In Their Knowledge Is Always Attended By An Increased Conviction Of Their Ignorance.