Galatians 6:9

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

And let us not lose heart and grow weary and faint in acting nobly and doing right, for in due time and at the appointed season we shall reap, if we do not loosen and relax our courage and faint. Amplified Bible

So don't get tired of doing what is good. Don't get discouraged and give up, for we will reap a harvest of blessing at the appropriate time. NLT

So let's not allow ourselves to get fatigued doing good. At the right time we will harvest a good crop if we don't give up, or quit. Message Bible