We will be able to reap, if we do not become weary  -  Galatians 6:9

And let us not be weary in well doing: for in due season we shall reap, if we faint not.

Paul reminded his readers that we should not become discouraged because reward is certain, even though it might not be immediate. In the physical realm, wheat is not harvested the day after it is sown and in the spiritual realm, rewards will follow faithful sowing in due season.