He becomes unclean, so to speak.

And that is what we mean by this chapter heading "_Cleanliness of Body and Mind_." It was not intended to point out the proper way to keep our faces and hands clean, or as a sermon, but rather to show ourselves that _the clean body begets the clean mind_, the two together constituting compelling tendencies toward _the clean spirit_.

A move in the direction of these takes us out of the rut of life.
No matter what cause we dig up with which to explain our success in life we cannot neglect this most important one--_the careful selection of our acquaintances_.

And this doesn't mean that one must be a snob.

Far from it.