There is always some madness in love. But there is also always some reason in madness.
We're all mad here.
Those who live without madness are not as wise as they think.
Wisdom has its excesses, and has no less need of moderation than does folly.
There is only one difference between a madman and me. I am not mad.
Anger is a short madness.
You must acquire the best knowledge first, and without delay; it is the height of madness to learn what you will later have to unlearn.
Love is merely a madness.
Excess of grief for the dead is madness for it is an injury to the living, and the dead know it not.
There is no great genius without a mixture of madness.
Jealousy is bred in doubts. When those doubts change into certainties, then the passion either ceases or turns absolute madness.
Jealousy lives upon doubts. It becomes madness or ceases entirely as soon as we pass from doubt to certainty.
Not doubt, certainty is what drives one insane.
The extreme limit of wisdom — that’s what the public calls madness.
