What Blessings Come When We Use the Priesthood Properly?

"The Lord has promised great blessings to righteous priesthood holders who use the priesthood to bless others:

“Then shall thy confidence wax strong in the presence of God; and the doctrine of the priesthood shall distil upon thy soul as the dews from heaven.

“The Holy Ghost shall be thy constant companion, and thy scepter an unchanging scepter of righteousness and truth; and thy dominion shall be an everlasting dominion, and without compulsory means it shall flow unto thee forever and ever” (D&C 121:45–46).

President David O. McKay promised every man who uses the priesthood in righteousness that he “will find his life sweetened, his discernment sharpened to decide quickly between right and wrong, his feelings tender and compassionate, yet his spirit strong and valiant in defense of right; he will find the priesthood a never failing source of happiness—a well of living water springing up unto eternal life” (Teachings of Presidents of the Church: David O. McKay [2003], 116)." - LDS.ORG

D&C 121:36 That the rights of the priesthood are inseparably connected with the powers of heaven, and that the powers of heaven cannot be controlled nor handled only upon the principles of righteousness.

D&C 84:33 For whoso is faithful unto the obtaining these two priesthoods of which I have spoken, and the magnifyingtheir calling, are sanctified by the Spirit unto the renewingof their bodies.
34 They become the sons of Moses and of Aaron and the seed of Abraham, and the church and kingdom, and the elect of God.
35 And also all they who receive this priesthood receiveme, saith the Lord;
36 For he that receiveth my servants receiveth me;
37 And he that receiveth me receiveth my Father;
38 And he that receiveth my Father receiveth my Father’s kingdom; therefore all that my Father hath shall be given unto him.