"I make more mistakes than anyone else I know, and sooner or later, I patent most of them." - Thomas Edison

"The willingness to make a big mistake is often the birth of big success." - Roy H. Williams

Sir Richard Branson of Virgin fame has had many more failures than successes. He says, "If there's one thing above all from which I've learnt how to survive in business, it's been from making mistakes - and the more mistakes you make the more you learn."

"The man who makes no mistakes does not usually make anything." - Edward John Phelps, American Lawyer and diplomat. 

My recollection of the of the quote from the movie, 'The Life of Brian'... "You started with nothing, and go back to nothing, so what have you got to lose? Nothing!"

And of course... Wise men and women learn from other people's mistakes. 

So make mistakes. Study the mistakes of others. Document. Learn. And try again.