What Is Love

To love is to place our happiness in the happiness of another.
Gottfried Wilhelm Leibniz

Gottfried Wilhelm Leibniz (b. 1646, d. 1716) was a German philosopher, mathematician, and logician who is probably most well known for having invented the differential and integral calculus (independently of Sir Isaac Newton). In his correspondence with the leading intellectual and political figures of his era, he discussed mathematics, logic, science, history, law, and theology.

http://mally.stanford.edu/leibniz.html