Galatians 6:9(New King James Version)
9 And let us not grow weary while doing good, for in due season we shall reap if we do not lose heart.
Galatians 6:9(New Century Version)
9 We must not become tired of doing good. We will receive our harvest of eternal life at the right time if we do not give up.
There are times in this life when we feel like quitting; times when the burdens and difficulties become so large that we don't think we have it in us anymore to survive. We thought that as Christians that somehow this would all be easier, that we would be insulated from the "bad" things.
But we were never promised that life would be nothing but "smooth sailing", and Jesus warned us that by following Him, we would even have more trouble. Many in this world face constant persecution and some even death, because of their love and service for Jesus.
Everyone goes through times of trouble, and if you aren't going through it now, you will very soon in the future. The great thing about following Jesus Christ is that in the trouble, He promises to be with us. God's plan is not that we won't have trouble, but that we will be refined and stronger for it, and that in facing our difficulties, we will be better prepared when future difficulties come. And if our trouble is because of service to Him, then He will have a place for us in eternity.
Whatever you are going through right now, don't give up. God has a plan for your life, and He will help you as you go through it.