I delight to do thy will, O my God: yea, thy law is within my heart. Psalm 40:8
Only those who devote themselves to His service, saying, "Here am I; send me" (Isaiah 6:8), to open blind eyes, to turn men from darkness to light and from the power of Satan unto God, that they may receive forgiveness of sins and inheritance among them which are sanctified" (Acts 26:18)--they alone pray in sincerity, "Thy kingdom come."
"Thy will be done in earth, as it is in heaven" (Matthew 6:10). The will of God is expressed in the precepts of His holy law, and the principles of this law are the principles of heaven. The angels of heaven attain unto no higher knowledge than to know the will of God, and to do His will is the highest service that can engage their powers.
But in heaven, service is not rendered in the spirit of legality. When Satan rebelled against the law of Jehovah, the thought that there was a law came to the angels almost as an awakening to something unthought of. In their ministry the angels are not as servants, but as sons. There is perfect unity between them and their Creator. Obedience is to them no drudgery. Love for God makes their service a joy. So in every soul wherein Christ, the hope of glory, dwells, His words are re-echoed, "I delight to do Thy will, O My God: yea, Thy law is within My heart" (Psalm 40:8). (Thoughts from the Mount of Blessing, 108, 109)
Reflection: A sign of true conversion is our desire to please God through willing obedience to His commands.