Lying on a feather mattress or quilt will not bring you renown.

Love shows itself more in adversity than in prosperity; as light does, which shines most where the place is darkest.

Those who fall in love with practice without science are like a sailor who enters a ship without a helm or a compass, and who never can be certain whither he is going.

Thou, O God, dost sell us all good things at the price of labor.

No human investigation can be called real science if it cannot be demonstrated mathematically.

Men of genius sometimes accomplish most when they work least, for they are thinking out inventions.

Black is like a broken vessel, which is deprived of the capacity to contain anything.