Thou lovest righteousness, and hatest wickedness: therefore God, Thy God, hath anointed Thee with the oil of gladness above Thy fellows. – Psalm 45:7

Did not David say, “Thou anointest mine head with oil; my cup runneth over”? so that we can say of ourselves what we say of our Lord, we are anointed, for He was anointed. We through Jesus Christ, are anointed to an office, “for He hath made us”-whisper it to one another in the joy of delight-“He hath made us kings and priests unto God, and we shall reign for ever and ever.” When the oil went on Aaron’s head, you know how it ran down his beard, even Aaron’s beard, unto the skirts of his garments, and now this day this anointing oil, which made the king and the priest, has fallen upon us too. Blessed be His name! shall we not be glad? It is very inconsistent with our position if we are not. Are you a king and do you not rejoice?

“Why should the children of our King
Go mourning all their days?
Sweet Comforter, descend and bring
Some unction of Thy grace.”

May the gladness now come to you. You are priests to God. Shall the anointed priests serve their Lord with gloomy countenances? No: rejoice in the Lord always, all ye priests of His that are anointed to this blessed work. “Bless the Lord, O house of Israel: bless the Lord, O house of Aaron.” ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/1273.cfm