No one who achieves success does so without acknowledging the help of others. The wise and confident acknowledge this help with gratitude.

Algebra is the intellectual instrument which has been created for rendering clear the quantitative aspects of the world.

Speech is human nature itself, with none of the artificiality of written language.

The many become one and are increased by one.

Every philosophy is tinged with the coloring of some secret imaginative background, which never emerges explicitly into its train of reasoning.

An unflinching determination to take the whole evidence into account is the only method of preservation against the fluctuating extremes of fashionable opinion.

The art of progress is to preserve order amid change, and to preserve change amid order. Life refuses to be embalmed alive. The more prolonged the halt in some unrelieved system of order, the greater the crash of the dead society.