Edison failed 10,000 times before he made the electric light. Do not be discouraged if you fail a few times. Napoleon Hill
You can be discouraged by failure, or you can learn from it. So go ahead and make mistakes, make all you can. Because, remember that's where you'll find success - on the far side of failure. Thomas J. Watson
Never be discouraged because good things get on so slowly here; and never fail daily to do that good which lies next to your hand. George MacDonald
Continuous, unflagging effort, persistence and determination will win. Let not the man be discouraged who has these. James Whitcomb Riley
A lot of actors ask me "what do you do? How do you get into the business?” My only answer is don't be discouraged. ... You have to commit your life to it, almost, and never give up. It's a cliché, but it's true. Leonardo DiCaprio
We want great men who, when fortune frowns, will not be discouraged. Henry Knox