Voltaire's Philosophical Dictionary

This book does not demand continuous reading; but at whatever place one opens it, one will find matter for reflection. The most useful books are those of which readers themselves compose half; they extend the thoughts of which the germ is presented to them; they correct what seems defective to them, and they fortify by their reflections what seems to them weak.
It is only really by enlightened people that this book can be read; the ordinary man is not made for such knowledge; philosophy will...