Never give up, because you never know if the next try is going to be the one that works.
For every failure, there's an alternative course of action. You just have to find it. When you come to a roadblock, take a detour.
When you reach an obstacle, turn it into an opportunity. You have the choice. You can overcome and be a winner, or you can allow it to overcome you and be a loser. The choice is yours and yours alone. Refuse to throw in the towel. Go that extra mile that failures refuse to travel. It is far better to be exhausted from success than to be rested from failure.