“To live without philosophizing is in truth the same as keeping the eyes closed without attempting to open them.”

“The reading of all good books is like conversation with the finest men of past centuries.”

“Even if all knowledge could be found in books, where it is mixed in with so many useless things and confusingly heaped in such large volumes, it would take longer to read those books than we...”

“Dubium sapientiae initium. (Doubt is the origin of wisdom.)”

“Some years ago I was struck by the large number of falsehoods that I had accepted as true in my childhood, and by the highly doubtful nature of the whole edifice that I had subsequently base...”