I believe that this verse is as much a divine command as “You
shall not steal” (Ex. 20:15). But what does it mean to fret? One
person once defined it as that which makes a person rough on
the surface, causing him to rub and wear himself and others away.
Isn’t it true that an irritable, irrational,and critical person not only
wears himself out but is also very draining and tiring to others?
When we worry and fret, we are a constant annoyance. This psalm
not only says, “Do not fret because of evil men” but leaves no
room for fretting whatsoever. It is very harmful, and God does
not want us to hurt ourselves or others.
Any physician can tell you that a fit of anger is more harmful
to your system than a fever and that a disposition of continual
fretting is not conducive to a healthy body. The next step
down from fretting is being quick-tempered, and that amounts
to anger. May we set it aside once and for all and simply be obedient
to the command “Do not fret.” Margaret Bottome