1 Corinthians 15:10
But, by the grace of God, I am what I am; and his grace, which was bestowed on me, has not been bestowed in vain: but I have labored more abundantly than they all; not I, how ever, but the grace of God which was with me.
1 Corinthians 15:58
Therefore, my be loved brethren, be firm, immovable, always abounding in the work of the Lord; for you know that your labor is not in vain in the Lord.
Galatians 6:9
Let us not become weary in well doing: for in due season we shall reap, if we faint not.
Colossians 1:29
to which end I also labor, striving according to his energy, which works in me mightily.