Hebrews 1:7

Instead of being sovereign, the angels are servants. The fourth quotation is from Psalms 104:4. By describing the angels as "winds" the psalmist was drawing attention to their spirit nature, invisibility, power, and role as servants of a higher Power. As flames of fire they are God’s agents of judgment and illumination. Wind and fire were also symbols of the Holy Spirit in the Old Testament. They were appropriate designations of both the Holy Spirit and angels because both served the Father in similar ways as His servants. Even though the angels are as swift as wind and as powerful as fire, they are inferior to the Son.