From The Gospel of Matthew by Curtis Mitch and Edward Sri, reflecting on Matthew 20:1-16:
The parable of the vineyard workers shines a spotlight on the extravagant generosity of God. The late hires received from the divine landowner the same compensation as the early arrivals, yet this was neither earned by their efforts nor owed to them according to the terms of the contract. It was not something they deserved or merited. It was simply a gift that the Lord was free to bestow at his good pleasure.