Mental Relaxation
What is important for mental relaxation, apparently, is not that a man
shall try to set his mind at absolute rest, for that seems to be
impossible, if a man really has a mind; nor that he shall occupy it
with trivial things (because his interest will not be caught by them
and will revert to the last serious thing that he was doing), but that
he shall have an outlet for mental activity in entirely another
direction from that to which he usually devotes himself. In other
words, it is important that a man shall have a hobby, and that he
shall ride that hobby whenever his ordinary business, whatever that
may be, will permit him, and the more interesting the hobby, the
better.