Here's my collection of high resolution picture quotes about optimism.
"A pessimist is a man who thinks everybody is as nasty as himself, and hates them for it." ~ George Bernard Shaw
"A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty." ~ Winston S. Churchill
"Choose to be optimistic, it feels better." ~ Dalai Lama XIV
"Don't cry because it's over, smile because it happened." ~ Dr. Seuss
"Dwell on the beauty of life. Watch the stars, and see yourself running with them." ~ Marcus Aurelius, Meditations
"Even the darkest night will end and the sun will rise." ~ Victor Hugo, Les Misérables
"Expect the best, prepare for the worst." ~ Muhammad Ali Jinnah
"Only those who attempt the absurd can achieve the impossible." ~ Albert Einstein
"Optimism is essential to achievement and it is also the foundation of courage and true progress." ~ Nicholas M. Butler
"Optimism is the faith that leads to achievement. Nothing can be done without hope and confidence." ~ Helen Keller
"Pessimism leads to weakness, optimism to power." ~ William James
"Remember, no effort that we make to attain something beautiful is ever lost." ~ Helen Keller
"Some people grumble that roses have thorns; I am grateful that thorns have roses." ~ Alphonse Karr, A Tour Round My Garden
"The optimist proclaims that we live in the best of all possible worlds; and the pessimist fears this is true." ~ James Branch Cabell, The Silver Stallion
"There is some good in this world, and it's worth fighting for." ~ J.R.R. Tolkien, The Two Towers
"We are all in the gutter, but some of us are looking at the stars." ~ Oscar Wilde, Lady Windermere's Fan
"Write it on your heart that every day is the best day in the year." ~ Ralph Waldo Emerson
"You'll never find a rainbow if you're looking down." ~ Charles Chaplin