1 Corinthians 15:10
But it is through the love of God that I am what I am, and the love that he showed me has not been wasted. No, I have toiled harder than any of them, and yet it was not I, but the love of God working with me.
1 Corinthians 15:58
Therefore, my dear Brothers, stand firm, unshaken, always diligent in the Lord's work, for you know that, in union with him, your toil is not in vain.
Galatians 6:9
Let us never tire of doing right, for at the proper season we shall reap our harvest, if we do not grow weary.
Colossians 1:29
It is for that I toil, struggling with all the energy which he inspires and which works powerfully within me.