John Chrysostom
Nothing brings greater delight to God than acts of charity. This is the reason why priests, monarchs, and prophets were consecrated with oil: this oil symbolizes the compassion of God. Furthermore, through this anointing, they were made to realize that rulers should embody more mercy; it illustrates that the Spirit descends upon individuals to inspire compassion, as God Himself shows mercy to humanity and engages with love: “Thou hast mercy on all,” it is proclaimed, “because Thou canst do all things” (Prem. 11:24). Thus, they received this anointing! The priestly office was established to promote mercy, and kings were likewise anointed with oil. If one aims to extol a ruler, the most fitting praise highlights their mercy: mercy is a vital trait of true authority. Keep in mind that the world was also brought into existence through grace, and strive to follow the example of the Lord.