The spirit from which we act is the principal matter.

Nature understands no jesting. She is always true, always serious, always severe. She is always right, and the errors are always those of man.

When you lose interest in anything, you also lose the memory for it.

Thought expands, but paralyzes; action animates, but narrows.

One must keep repeating the Truth.

Many people take no care of their money till they come nearly to the end of it, and others do just the same with their time.

What must the English and French think of the language of our philosophers when we Germans do not understand it ourselves?