John Chrysostom

Therefore, let us fear nothing so much as sin and transgression. Let us not fear punishment, and then we shall escape punishment. Even as the Three Children were not afraid of the furnace, and so escaped from the furnace. Such indeed it becomes the servants of God to be. …

Homilies Concerning The Statues 7:1 ↗

Ambrose of Milan

Nevertheless, I assert according to the Scriptures that He was able to spread out lowly places and open fields, just as He Himself says: 'I will walk before you and make mountains plain.' The force of the water itself could also make deeper things, which had settled, more turbulent: with such a movement of waves and such a surge of a more agitated element, which daily twists the depths of the sea and turns the sands out of the deep.

The Six Days of Creation, 3.15 ↗

Thomas Aquinas

Or because of strength, and as to this he says: I will go before you, preparing the place of your victory, by sending terror of you among your adversaries, the great ones, powerful above others, like the Babylonians; the gates of brass, the most powerful cities: he has broken gates of brass, and burst iron bars (Ps 107:16).

Commentary on Isaiah ↗