1 Corinthians 15:58

NIV: Therefore, my dear brothers and sisters, stand firm. Let nothing move you. Always give yourselves fully to the work of the Lord, because you know that your labor in the Lord is not in vain.

NLT: So, my dear brothers and sisters, be strong and steady, always enthusiastic about the Lord's work, for you know that nothing you do for the Lord is ever useless.