So we
1 Corinthians 15:10
and by the grace of God I am what I am, and His grace that [is] towards me came not in vain, but more abundantly than they all did I labour, yet not I, but the grace of God that [is] with me;
1 Corinthians 15:58
so that, my brethren beloved, become ye stedfast, unmovable, abounding in the work of the Lord at all times, knowing that your labour is not vain in the Lord.
Galatians 6:9
and in the doing good we may not be faint-hearted, for at the proper time we shall reap -- not desponding;
Colossians 1:29
for which also I labour, striving according to his working that is working in me in power.