The vines here represent the people in the world whom the Lord wants to store in His beautiful garner, the Heavenly Home, by and by.
The labourers are God's own people, whom He calls to bring those precious grapes into the garner.
God calls each one of us who loves Him to be a labourer in His Kingdom.
To one, who is perhaps strong and able, He gives work that will last him the whole long day of a long life!
Of another, He asks half a lifetime—of another, a quarter of a lifetime; or only one short hour perhaps!
To each one, when the day is ended, the Lord will give His own reward. If the worker has been faithful in what has been given him to do, the Lord of the Harvest will say: "Well done, good and faithful servant, enter into the joy of thy Lord."
Little children can work for this Heavenly Lord. They can do little kindnesses for Christ's sake; they can try to be like Jesus. They can listen for God's commands like little Samuel, and obey Him when He speaks to them.
These may be like the one hour servants, but they will get their full rewards!
Some of the servants of the Lord of the Harvest have very hard and toilsome work to do. He has given them that to do, and He will surely give them their pay!
What is that pay? Not a Roman penny; not any earthly coins or rewards; but they are promised that if they are wise, and turn many to righteousness, they shall shine as the stars for ever and ever!