Answer: Children of God do their work with all of their heart, working for the Lord, because we know that we will receive an inheritance from the Lord as our reward, (verses 23 and 24).
MORE INFORMATION AND/OR OTHER SCRIPTURE REFERENCES:
Acts 20:32: "Now I commit you to God and to the Word of His grace, which can build you up and give you an inheritance among all those who are sanctified."
1 Peter 1:3-4: "Praise be to the God and Father of our Lord Jesus Christ! In His great mercy He has given us new birth into a living hope through the resurrection of Jesus Christ from the dead, and into an inheritance that can never perish, spoil or fade--kept in heaven for you..."
In Matthew 25:34-40, Jesus says of those who have worked for Him:
"Then the King will say to those on His right, ‘Come, you who are blessed by My Father; take your inheritance, the kingdom prepared for you since the creation of the world. For I was hungry and you gave Me something to eat, I was thirsty and you gave Me something to drink, I was a stranger and you invited Me in, I needed clothes and you clothed Me, I was sick and you looked after Me, I was in prison and you came to visit Me.' Then the righteous will answer Him, ‘Lord, when did we see You hungry and feed You, or thirsty and give You something to drink? When did we see You a stranger and invite You in, or needing clothes and clothe You? When did we see You sick or in prison and go to visit You?' The King will reply, ‘I tell you the Truth, whatever you did for one of the least of these brothers of Mine, you did for Me.'"