Theophylact of Ohrid

The word "fear" is used in various meanings. Fear is called, first, conscious fear; the apostle now calls it conscience; it is also called reverence. Fear is called, second, passionate fear, experienced in the face of impending punishment; this fear is observed even in animals. Fear, third, is called initial fear, which occurs in those approaching the Lord as a result of the awareness that for their many transgressions they are worthy of punishment; moved by such fear, the harlot mentioned in the Gospel came to the Lord (Luke 7). …

Commentary on 1 Peter ↗

Oecumenius

Servants, be subject to your masters with all fear, not only to the good and gentle, but also to the unjust. For this is grace, if anyone endures grief for the sake of conscience toward God when suffering unjustly. For what credit is it if, when you are beaten for your sins, you take it patiently? But if, when you do good and suffer for it, you take it patiently, this is praiseworthy before God. "Servants, be subject." It must be understood that it means, that is, you are, just as when he said, Wives (1 Peter 3:1). …

Commentary on 1 Peter ↗

Clement of Alexandria

For as it is enjoined on them, "to be subject to their masters with all fear, not only to the good and gentle, but also to the froward," as Peter says; so fairness, and forbearance, and kindness, are what well becomes the masters.

The Instructor Book 3 ↗

Bede

Servants, be subject to your masters with all fear, not only to the good and gentle but also to the crooked, etc. He calls the crooked undisciplined, using a term derived from Greek speech. For in Greek, schola is called the place where young men usually devote themselves to literary studies and to listening to teachers; thus, schola is interpreted as leisure. Finally, in the psalm where we sing, "Be still, and know that I am God" (Psalm 46), for that which we say "be still," the Greek has σχολάζετε. …

Commentary on the Catholic Epistles ↗