For God is not unjust. He will not forget how hard you have worked for him and how you have shown your love to him by caring for other believers, as you still do. (Hebrews 6:10) (NLT).
This passage of Scripture provides wonderful insight into the character of God, profound instruction about one of the many ways in which we demonstrate our love for Him, and great encouragement concerning the service we perform in His Name.
First of all, Paul reminds us of our Lord's matchless mercy and boundless grace: He does not forget our faithfulness, but remembers our sins no more! Our Heavenly Father blots out our transgressions, consigning to oblivion even our darkest of sins, but remembers and rewards even the smallest act of kindness we show His children: "I—yes, I alone—will blot out your sins for my own sake and will never think of them again. . . . Truly I tell you, anyone who gives you a cup of water in my name because you belong to the Messiah will certainly not lose their reward." (Isaiah 43:25 (NLT); Mark 9:41 (NIV)).
In 1 Corinthians 13, Paul provides a comprehensive definition of love, in terms of its fundamental nature -- viz., love is patient, love is kind, love does not envy, etc. (1 Corinthians 13:4-7). In Hebrews 6:10, however, Paul gives us a very helpful and practical example of how to love God -- by caring for our fellow believers. Put differently, we love God by loving each other! Every act of kindness we show another believer is an act of kindness to the Lord! Every act of service we perform for another believer is an act of service to the Lord! When we demonstrate our love for each other, we demonstrate our love for the Lord.
Finally, Paul encourages us to persevere in serving God, by caring for one another, because God will not forget a single act of love and service we perform in His Name. He is a just God who rewards the hard work we do for Him and the care we show His children. Not a single sacrifice of love for the Lord and His saints is done in vain! One day, our faith, love, and hard work will be rewarded with an inheritance that far exceeds anything our minds can conceive. And this hope serves "as an anchor for the soul, firm and secure." (Hebrews 6:19).