Augustine of Hippo
Two forms of evil Who would not fear the profound darkness? Who would not tread carefully on the treacherous ground? If one finds himself in darkness and on a precarious path, where can he firmly place his foot? These represent the two forms of evil that serve as the gravest punishment for humanity: darkness, signifying ignorance; and slipperiness, symbolizing indulgence. The Psalmist anticipates their future existence but does not desire their arrival. For, inspired by the Spirit of God, the prophet articulates them as they unfold through God’s execution of justice: through a judgment that is true, good, righteous, holy, fervent, free from wrath or bitter envy, seeking not the persecution of adversaries, but the rightful punishment of moral failings.
What a dreadful path! Who does not tremble in darkness? Who would willingly tread the treacherous road? In the midst of shadows and slippery slopes, how shall one proceed? Where should one place their feet? These two calamities serve as the most severe afflictions for humanity: the darkness of ignorance and the peril of indulgence. Let the angel of the Lord pursue them, so they cannot find steadiness. For those wandering in the dark and treacherous ways, when confronted with the fear of a fall and the absence of light, they may choose to wait for illumination. Yet behold, the angel of the Lord is in pursuit. He prophesied that such trials would befall them, desiring not their fate but foreseeing it.
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The Prophet, speaking under the influence of the Holy Spirit, expresses this as God does—with faithful discernment, righteous and holy judgement; not swayed by wrath, envy, or hostility, but to enact justice upon wickedness with perfect righteousness; nevertheless, it stands as a prophecy.