Certainly it can do no harm to those who worry to see how their mental habit has been regarded, and is still regarded, by the concentrated wisdom of the ages.
An old proverb says: "It is not work, but worry, that kills." How true this is.

Congenial work is a health-bringer, a necessity for a normal life, a joy; it keeps the body in order, promotes digestion, induces the sleep of perfect restoration and is one of man's greatest blessings.

But worry brings dis-ease (want of ease), discomfort, wretchedness, promotes evil secretions which upset the normal workings of the body, and is a constant banisher and disturber of sleep.
Still another proverb says: "Worry killed the cat." Many people read this and fail to see its profound significance.

It must be remembered that in "the good old days," when this proverb was most rife, the superstitious held that a cat had _nine lives_.

Now, surely, the deep meaning of the proverb is made apparent.