Meher Baba was the actual source of "Don't worry. Be happy."
Here is one of his discourses about worrying. Enjoy!
"There are very few things in the mind which eat up as much
energy as worry. It is one of the most difficult things not
to worry about anything. Worry is experienced when things go
wrong, but in relation to past happenings it is idle merely
to wish that they might have been otherwise. The frozen past
is what it is, and no amount of worrying is going to make it
other than what it has been. But the limited ego-mind
identifies itself with its past, gets entangled with it and
keeps alive the pangs of frustrated desires. Thus worry
continues to grow into the mental life of man until the ego-mind
is burdened by the past. Worry is also experienced in relation
to the future when this future is expected to be disagreeable
in some way. In this case it seeks to justify itself as a
necessary part of the attempt to prepare for coping with the anticipated situations. But, things can never be helped merely
by worrying. Besides, many of the things which are anticipated
never turn up, or if they do occur, they turn out to be much
more acceptable than they were expected to be. Worry is the
product of feverish imagination working under the stimulus of desires. It is a living through of sufferings which are mostly
our own creation. Worry has never done anyone any good, and it
is very much worse than mere dissipation of psychic energy, for
it substantially curtails the joy and fullness of life."
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