"We cannot solve our problems with the same level of thinking that created them." (Albert Einstein)
"It is amazing what you can accomplish if you do not care who gets the credit." (President Harry S Truman)
"In the midst of winter, I finally learned that within me there lay an invincible summer." (Albert Camus, 1913 - 1960, French author & philosopher)
"If you're not part of the solution you must be part of the problem." (the commonly paraphrased version of the original quote: "What we're saying today is that you're either part of the solution, or you're part of the problem" by Eldridge Cleaver 1935-98, founder member and information minister of the Black Panthers, American political activist group, in a speech in 1968 - thanks RVP)
"A dream is just a dream. A goal is a dream with a plan and a deadline." (Harvey Mackay - thanks Brad Hanson)
"I have learned that success is to be measured not so much by the position that one has reached in life as by the obstacles overcome while trying to succeed." (Booker T Washington, 1856-1915, American Educator and African-American spokesman, thanks for quote M Kincaid, and for biography correction M Yates and A Chatterjee)
"Most people never run far enough on their first wind to find out they've got a second. Give your dreams all you've got and you'll be amazed at the energy that comes out of you." (William James, American Philosopher, 1842-1910 - thanks Jean Stevens)
"Whatever you can do - or dream you can, begin it. Boldness has genius, power and magic in it." (Johann Wolfgang von Goethe, German writer, 1749-1832 - thanks Yvonne Bent)
"A dwarf standing on the shoulders of a giant may see farther than the giant himself." (Didacus Stella, circa AD60 - and, as a matter of interest, abridged on the edge of an English £2 coin)
"If I have seen further it is by standing on the shoulders of giants." (Sir Isaac Newton, 1676.)
"The most important thing in life is not to capitalise on your successes - any fool can do that. The really important thing is to profit from your mistakes." (William Bolitho, from 'Twelve against the Gods')
"Out of the night that covers me, Black as the pit from pole to pole, I thank whatever gods may be, For my unconquerable soul. In the fell clutch of circumstance, I have not winced nor cried aloud: Under the bludgeonings of chance my head is bloody but unbowed . . . . . It matters not how strait the gait, how charged with punishments the scroll, I am the master of my fate: I am the captain of my soul." (WE Henley, 1849-1903, from 'Invictus')
"Management means helping people to get the best out of themselves, not organising things." (Lauren Appley)
"It's not the critic who counts, not the one who points out how the strong man stumbled or how the doer of deeds might have done them better. The credit belongs to the man who is actually in the arena; whose face is marred with the sweat and dust and blood; who strives valiantly; who errs and comes up short again and again; who knows the great enthusiasms, the great devotions and spends himself in a worthy cause and who, at best knows the triumph of high achievement and who at worst, if he fails, at least fails while daring greatly so that his place shall never be with those cold and timid souls who know neither victory nor defeat." (Theodore Roosevelt, 23 April 1923.)
"The world is divided into people who do things, and people who get the credit. Try, if you can, to belong to the first class. There's far less competition." (Dwight Morrow, 1935.)
"What does not kill us makes us stronger." (attributed to Friedrich Nietzsche, probably based on his words: "Out of life's school of war: What does not destroy me, makes me stronger." from The Twilight of the Idols, 1899)
"A life spent in making mistakes is not only more honourable but more useful than a life spent doing nothing." (George Bernard Shaw, 1856-1950.)
"I praise loudly. I blame softly." (Catherine the Great, 1729-1796.)