Aristotle could have avoided the mistake of thinking that women have fewer teeth than men, by the simple device of asking Mrs. Aristotle to keep her mouth open while he counted.

To fear love is to fear life, and those who fear life are already three parts dead.

Ideas and principles that do harm are as a rule, though not always, cloaks for evil passions.

Our instinctive emotions are those that we have inherited from a much more dangerous world, and contain, therefore, a larger portion of fear than they should.

In the part of this universe that we know there is great injustice, and often the good suffer, and often the wicked prosper, and one hardly knows which of those is the more annoying.

Religion is based, I think, primarily and mainly upon fear.

Love and knowledge led upwards to the heavens.