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. 1 Corinthians 15:58

But by the grace of God I am what I am: and his grace which was bestowed upon me was not in vain; but I laboured more abundantly than they all: yet not I, but the grace of God which was with me. 1 Corinthians 15:10

“Even to your old age I am he, and to gray hairs I will carry you. I have made, and I will bear; I will carry and will save.” Isaiah 46:4 (ESV)

He will bless them that fear the LORD, both small and great. Psalm 115:13