It is useful that while mankind are imperfect there should be different opinions, so is it that there should be different experiments of living; that free scope should be given to varieties of character, short of injury to others.

The application of algebra to geometry ... has immortalized the name of Descartes, and constitutes the greatest single step ever made in the progress of the exact sciences.

A person should be free to do as he likes in his own concerns; but he ought not to be free to do as he likes in acting for another, under the pretext that the affairs of the other are his own affairs.

It is useful that while mankind are imperfect there should be different opinions, so is it that there should be different experiments of living; that free scope should be given to varieties of character, short of injury to others.

Popular opinions, on subjects not palpable to sense, are often true, but seldom or never the whole truth.

Judgement is given to men that they may use it. Because it may be used erroneously, are men to be told that they ought not to use it at all?

That a thing is peculiar; is no argument for its being blamable; since the most criminal actions are to a being like man not more unnatural than most of the virtues.