There is more joy in the presence of the angels in heaven over one sinner that repeats than over ninety and nine just persons who need no repentance. There is joy with the Father and with Christ. All heaven is interested in the salvation of man. He who is instrumental in saving a soul is at liberty to rejoice; for angels of God have witnessed his efforts with the most intense interest, and rejoice with him in his success.—Testimonies for the Church 4:264.
Humanity is still as much the object of heaven’s solicitude as when common men of common occupations met angels at noon-day, and talked with the heavenly messengers in the vineyards and the fields. To us in the common walks of life, heaven may be very near. Angels from the courts above will attend the steps of those who come and go at God’s command.—The Desire of Ages, 48.
All the resources of heaven are at the command of those who are seeking to save the lost. Angels will help you to reach the most careless and the most hardened. And when one is brought back to God, all heaven is made glad; seraphs and cherubs touch their golden harps, and sing praises to God and the Lamb for their mercy and loving-kindness to the children of men.—Christ’s Object Lessons, 197. RRe 210
Shouts of triumph ascend from the angels and the redeemed saints, that they are to be no more annoyed and tempted by Satan, and that the inhabitants of other worlds are delivered from his presence and temptations.—The Spirit of Prophecy 4:474-475. Hvn 118
Likewise, I say unto you, there is joy in the presence of the angels of God over one sinner that repenteth. Luke 15:10. KJV