1 Corinthians 15:58
Therefore, my beloved brethren, be ye stedfast, unmoveable, always abounding in the work of the Lord, forasmuch as ye know that your labour is not in vain in the Lord.
In 1 Corinthians 15, Paul addressed the truth of the resurrection of Jesus Christ and the fact that faith in Him is not in vain. With these two things in mind, Paul exhorts us to remain steadfast, unmovable, and to always abound in the work of Christ. The truth of the resurrection provides hope and steadfastness, and enables us to go on in the face of overwhelming and difficult circumstances.