To put force, ability, or anything of the nature of an active faculty; to put in vigorous action; to bring into active operation; as, to exert the strength of the body, limbs, faculties, or imagination; to exert the mind or the voice.
To put forth, as the result or exercise of effort; to bring to bear; to do or perform.
There's a tremendous difference between alone and lonely. You could be lonely in a group of people. I like being alone. I like eating by myself. I go home at night and just watch a movie or hang out with my dog. I have to exert myself and really say, oh God, I've got to see my friends 'cause I'm too content being by myself. Drew Barrymore
The power I exert on the court depends on the power of my arguments, not on my gender. Sandra Day O'Connor
You can never really live anyone else's life, not even your child's. The influence you exert is through your own life, and what you've become yourself. Eleanor Roosevelt
Situational variables can exert powerful influences over human behavior, more so that we recognize or acknowledge. Philip Zimbardo
My health may be better preserved if I exert myself less, but in the end doesn't each person give his life for his calling? Clara Schumann