We are in a battle against sin and a to-the-death fight against the enemy. It's a tiring endeavor and our very best efforts will often leave us exhausted and vulnerable at the worst possible time. As we grow weary we often forget that we aren't fighting alone but that God is fighting for us. He doesn't want us to fail--He is actively working to bring us success.
God is not a distant Father and King who sits on His throne watching our lives like an episode of a reality show. He is literally by our side engaging in the fight and is consumed with passion for our success. When we grow weary He does not and will continue to be the strength we seek. His desire for us to succeed is greater than our own yearning for victory.
Don't give up--God hasn't given up on you.