Thy will be done on earth, as it is in heaven.
That is,
The good and gracious will of God is done indeed without our prayer; but we pray in this petition that it may be done also among us.
This is done when God brings to nothing all evil plans and purposes of the devil, the world, and our own flesh, that would hinder the hallowing of His name and the coming of His kingdom.
On the other hand, it is the good and gracious will of God to strengthen us and keep us steadfast in His Word and in faith, until death.
291. What do you pray for in the third petition?
I pray that the will of God may be done among us on earth, as it is in heaven.
292. What is the will of God?
It is the will of God that all His rational creatures should praise Him forever in perfect holiness and happiness.
293. Where is the will of God done in this manner?