A philosopher will not believe what he sees because he is too busy speculating about what he does not see.

Nature intends that, at fixed periods, men should succeed each other by the instrumentality of death. We shall never outwit Nature; we shall die as usual.

The Art of Flying is but newly invented, twill improve by degrees, and in time grow perfect; then we may fly as far as the Moon.

Modesty in women has two special advantages,--it enhances beauty and veils uncomeliness.

Behold a universe so immense that I am lost in it. I no longer know where I am. I am just nothing at all. Our world is terrifying in its insignificance.

Nature is never so admired as when she is understood.

I have lived one hundred years; and I die with the consolation of never having thrown the slightest ridicule upon the smallest virtue.