The Rules of Courtly Love

Love is a certain inborn suffering derived from the sight of and excessive meditation upon the beauty of the opposite sex, which causes each one to wish above all things the embraces of the other and by common desire to carry out all of love's precepts in the other's embraces.

courtly: people who live in the castle.
excessive meditation: thinking about him all the time.
embraces of the other: to be held by them.
common desire: carry out rules in the other.