Threat or Promise?

The words of the Lord's prayer, 'thy will be done on earth as it is in heaven" always seemed like a threat to me. Viewing the will of God as a threat, I shrunk in fear from it. It was a danger to me. 

Then I learned about St. Faustina and the Divine Mercy Chaplet part of which says

"Eternal God, in whom mercy is endless and the treasury of compassion inexhaustible, look kindly upon us and increase Your mercy in us, that in difficult moments we might not despair nor become despondent, but with great confidence submit ourselves to Your holy will, which is Love and Mercy itself."

And then I saw the words of the Lord's prayer in a different light. It was not a threat. It was a glorious promise. And God does not make empty promises. God fulfills their promises (Joshua 23:14)