You have considerable power ...

You have considerable power to construct self-helping thoughts, feelings and actions as well as to construct self-defeating behaviors. You have the ability, if you use it, to choose healthy instead of unhealthy thinking, feeling and acting.
 Albert Ellis

Quotes from the same author

The best years of your life are the ones in which you decide your problems are your own. You do not blame them on your mother, the ecology, or the president. You realize that you control your own destiny.
 Albert Ellis
Beginning in the 1960s, many studies showed that people who hold what we call irrational beliefs are significantly more disturbed than when they don't hold them, and the more strongly they hold them, the more disturbed they tend to be.
 Albert Ellis
The more sinful and guilty a person tends to feel, the less chance there is that he will be a happy, healthy, or law-abiding citizen. He will become a compulsive wrong-doer.
 Albert Ellis
People don't just get upset. They contribute to their upsetness. They always have the power to think, and to think about their thinking, and to think about thinking about their thinking, which the goddamn dolphin, as far as we know, can't do. Therefore they have much greater ability to change themselves than any other animal has.
 Albert Ellis
By not caring too much about what people think, I'm able to think for myself and propagate ideas which are very often unpopular. And I succeed.
 Albert Ellis