Charles Ellicott Commentary 1 Corinthians 15:58

"Wherefore, my beloved brethren, be ye stedfast, unmoveable, always abounding in the work of the Lord, forasmuch as ye know that your labor is not vain in the Lord." — 1 Corinthians 15:58 (ASV)

Therefore.—Because all this is so—because there is a life hereafter—let this life here be worthy of it. You might grow weak and faint-hearted if you could think that all your work for God and truth here might be wasted; but it is not so. It cannot be in vain if it is in the Lord.

It is very striking and very expressive of the real spirit of the gospel that a chapter which leads us step by step through the calm process of logic, and through glowing passages of resistless eloquence to the sublimest thoughts of immortality, should at last thus close with words of plain and practical duty. Christianity never separates, in precept or in promise, the life that now is and that which is to come.