1 Corinthians 15:14, 58
1 Corinthians 15:14 NCV
And if Christ has not been raised, then our preaching is worth nothing, and your faith is worth nothing.
1 Corinthians 15:58 NCV
So my dear brothers and sisters, stand strong. Do not let anything move you. Always give yourselves fully to the work of the Lord, because you know that your work in the Lord is never wasted.