Objection:
If God is a Trinity and God would naturally be our Master, then how is Jesus also our Master and Lord in Jude 4?

Defense:
There is no difficulty present when we understand how the terms are used biblically. God is a Trinity, and He is referred to as the King (Psalm 47:7), the Rock (Deuteronomy 32:4), the Almighty (Genesis 17:1), the Most High (Genesis 14:18), and the Lord (Hebrew: Adonay). He is the sovereign ruler over all creation.

In the New Testament Greek, the word for "Master" or "Sovereign Lord" is δεσπότης, despótēs, which occurs 10 times (Luke 2:29; Acts 4:24; 1 Tim. 6:1-2, 2 Tim. 2:21, Titus 2:9; 1 Pet. 2:18; 2 Pet. 2:1; Jude 4; Rev. 6:10). These ten present a more interesting set of data:

• δεσπότης, despótēs as Lord in reference to God: Luke 2:29; Acts 4:24; 2 Tim. 2:21; Rev. 6:10
• δεσπότης, despótēs in reference to Jesus: 2 Pet. 2:1; Jude 4
• δεσπότης, despótēs in reference to human masters: 1 Tim. 6:1, 2; Titus 2:9; 1 Pet. 2:18

So, God is called the Lord, the despótēs, the master, in that sense. Given that the Trinity is one God in three distinct persons, we can conclude that God is our Lord. He is the sovereign king. By default, He is also our Master. What is interesting is that Jesus is also referred to as our Lord and Master. This is logical since He is God in the flesh (John 1:1, 14; Col. 2:9; Heb. 1:8).

Conclusion

Jesus is our Master, as is God the Father. According to the historic Christian doctrine of the Trinity, Jesus is God, the Son, who shares the single divine nature and will of the one God. He is the one who is our mediator (1 Tim. 2:5), our High Priest (Heb. 6:20; 7:25), and our Lord and Master (Jude 4). Why? Because He is God in flesh.