Never, never, never give in!
You may encounter many defeats, but you must not be defeated. In fact, it may be necessary to encounter the defeats, so you can know who you are, what you can rise from, how you can still come out of it.
The brick walls are there for a reason. The brick walls are not there to keep us out. The brick walls are there to give us a chance to show how badly we want something. Because the brick walls are there to stop the people who don't want it badly enough. They're there to stop the other people.
Rivers know this: there is no hurry. We shall get there some day.
If you are going through hell, keep going.
Success is not final, failure is not fatal: it is the courage to continue that counts.