They _can_, if they _will_.

It is simply a question of wanting to be free earnestly enough to work for freedom.
Is freedom from worry worth while; is it worth struggling for?
To me, it is one of the great blessings of life that worry is largely, if not entirely, eliminated.

I would not go back to the old worrying days for all the wealth of Morgan, Rockefeller, and Carnegie combined.
As for the uselessness of worry; who is there, that has studied the action of worry, that ever found any of the problems it was concerned over improved by all the hours of worry devoted to it.

Worry never solved a problem yet; worry muddies the water still further instead of clearing it; worry adds to the tangle instead of releasing it; worry beclouds the mind, prevents sane judgment, confuses the reason, and leads one to decisions that never ought to be made, and so to an uncertainty, as vexatious and irritating as is the original problem to be solved.

If the worry pointed a way out of the difficulty I would extol worry and regard it as a bitter draught of medicine, to be swallowed in a hurry, but producing a beneficial result.