A man should carry nature in his head.
Evil is merely privative, not absolute: it is like cold, which is the privation of beat.
Nothing is more simple than greatness; indeed, to be simple is to be great.
The religion which is to guide and fulfill the present and coming ages, whatever else it be, must be intellectual. The scientific mind must have a faith which is science.
The greatest discoveries are those that shed light unto ourselves.
An action is the perfection and publication of thought.