Gregory the Great, on Isa 43:2

“When thou shalt pass through the waters, I will be with thee, and the rivers shall not cover thee: when thou shalt walk in the fire, thou shalt not be burnt, and the flames shall not burn in thee:”

“And through the prophet the Lord promises saying, "When thou passest through the waters, I will be with thee, and the rivers shall not overflow thee." For the rivers overflow those whom the active business of this world confounds with perturbation of mind. But he who is sustained in mind by the grace of the Holy Spirit passes through the waters, and yet is not overflowed by the rivers, because in the midst of crowds of peoples he so proceeds along his way as not to sink the head of his mind beneath the active business of the world.”

Imported from an open dataset — not yet checked against the printed edition.