"If you are distressed by anything external, the pain is not due to the thing itself but to your own estimate of it; and this you have the power to revoke at any moment." -— Marcus Aurelius  

"I am more and more convinced that our happiness or our unhappiness depends far more on the way we meet the events of life than on the nature of those events themselves." -— Karl Wilhelm Von Humboldt  

"Stress comes from within; it is your reaction to circumstances, not the circumstances themselves." -– Brian Tracy 

"Nature tops the list of potent tranquilizers and stress reducers. The mere sound of moving water has been shown to lower blood pressure." -- Patch Adams 

"Denying or refusing to deal with some unpleasant fact in your life is the source of most stress and unhappiness." -– Brian Tracy