It is the selfish occupations that produce nerve-exhaustion.

Those that are unselfish seldom result in the disturbance of the harmony or equilibrium of our nature--whether we regard it as physical, mental, or spiritual.

This may seem to be a trancendental statement--perhaps it is.

But I am confidently assured of its essential truth.

That man or woman who is truly engaged in an unselfish work--a work that is for the good of others--has a right to look for, to expect and to receive from the great All Source of strength, power and serenity all that is needed to keep the body, mind and soul in harmony, consequently in perfect health and free from worry.
Hence the apparent paradox that, if you would care for yourself you must disregard yourself in your loving care for others.
One great reason why worry produces nervous prostration is that it induces insomnia.
Worry and sleeplessness are twin sisters.