Hypotheses are the scaffolds which are erected in front of a building and removedd when the building is completed. They are indispensable to the worker; but the worker must not mistake the scaffolding for the building.

Men are so constituted that every one undertakes what he sees another successful in, whether he has aptitude for it or not.

I laugh at my heart, and do its will

Necessity is cruel, but it is the only test of inward strength. Every fool may live according to his own likings.

Hatred is something peculiar. You will always find it strongest and most violent where there is the lowest degree of culture.

What is hardest of all? That which seems most simple: to see with your eyes what is before your eyes.

Idea and experience will never coincide in the center; only through art and action are they united.