To be happy, one must have a good stomach and a bad heart.

As astronomy is the daughter of idleness, geometry is the daughter of property.

There are three things I have loved but never understood. Art, music and women.

Nature is never so admired as when she is understood.

To despise theory is to have the excessively vain pretension to do without knowing what one does, and to speak without knowing what one says.

Leibniz never married; he had considered it at the age of fifty; but the person he had in mind asked for time to reflect. This gave Leibniz time to reflect, too, and so he never married.

If I had my hand full of truth, I would take good care how I opened it.