Purity is a negative state and therefore contrary to nature.

Persons of demonic nature do not know what to do and what not to do. They neither have purity nor good conduct nor truthfulness.

Come, night; come, Romeo; come, thou day in night; For thou wilt lie upon the wings of night Whiter than new snow upon a raven's back.

Purity and simplicity are the two wings with which man soars above the earth and all temporary nature.

I've heard my teacher say, where there are machines, there are bound to be machine worries; where there are machine worries, there are bound to be machine hearts. With a machine heart in your breast, you've spoiled what was pure and simple; and without the pure and simple, the life of the spirit knows no rest.

It's a shame that the only thing a man can do for eight hours a day is work. He can't eat for eight hours; he can't drink for eight hours; he can't make love for eight hours. The only thing a man can do for eight hours is work.