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
Negation is the mind's first freedom, yet a negative habit is fruitful only so long as we exert ourselves to overcome it, adapt it to our needs; once acquired it can imprison us. Emile M. Cioran
Every human being has a work to carry on within, duties to perform abroad, influence to exert, which are peculiarly his, and which no conscience but his own can teach. William Ellery Channing
Situational variables can exert powerful influences over human behavior, more so that we recognize or acknowledge. Philip Zimbardo
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