I tried a search but couldn't see it posted, so I'm hoping this is new here. If not, ahh well, probably deserves another mention.
I was searching for some wallpapers, something to encourage me to work harder, strive farther, aim higher etc and I stumbled across this quote. I find it quite inspiring and will try to memorise it.
“It is not the critic who counts; not the man who points out how the strong man stumbles, or where the doer of deeds could have done them better. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood, who strives valiantly; who errs and comes short again and again; because there is not effort without error and shortcomings; but who does actually strive to do the deed; who knows the great enthusiasm, the great devotion, who spends himself in a worthy cause, who at the best knows in the end the triumph of high achievement and who at the worst, if he fails, at least he 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