The link below is a good read, but mostly for this graphic that makes a good point on focusing on what you can control and ignoring or minimizing what you can't. It's in-line with the serenity prayer ("God grant me the serenity to accept the things I cannot change; courage to change the things I can; and wisdom to know the difference,") which I find to be really useful guidance.
Uncommon Man's Creed
"I do not choose to be a common man. It is my right to be uncommon -- if I can. I seek opportunity -- not security. I do not wish to be a kept citizen, humbled and dulled by having the state look after me. I wish to take the calculated risk; to dream and to build, to fail and to succeed. I refuse to barter incentive for a dole, I prefer the challenges of life to the guaranteed existence; the thrill of fulfillment to the stale calm of utopia. I will not trade freedom for beneficence, nor my dignity for a handout. I will never cower before any master, nor bend to any threat. It is my heritage to stand erect, proud, and unafraid, to think and act for myself, to enjoy the benefit of my creations, and to face the world boldly and say, "this I have done." All this is what it means to be an American." -- Anonymous
