Passion cares nothing for the mind.

Love, hate, ambition, anger, avarice, either make a slave of intelligence to serve their impulses, or break down its impotent opposition with the unanswerable argument of brute force, and tear it to pieces with iron hands.
Love is the first, the greatest, the gentlest, the most cruel, the most irresistible of passions.

In his least form he is mighty.

A little love has destroyed many a great friendship.

The merest outward semblance of love has made such havoc as no intellect could repair.