Thomas Aquinas, on Isa 49:2

“And he hath made my mouth like a sharp sword: in the shadow of his hand he hath protected me, and hath made me as a chosen arrow: in his quiver he hath hidden me.”

“Second, the efficacy of their prayer: and he has made my mouth, my prayer, like a sharp sword, penetrating unto the ears of God and the heart of his mercy: and the sword of the Spirit (Eph 6:17). Third, the help of divine protection: in the shadow of his hand, that is, under the protection of his power; as an archer hides a chosen arrow, to preserve it: protect me under the shadow of your wings (Ps 16[17]:8); he has hidden me in his tabernacle (Ps 26[27]:5). 897. According to others, of Cyrus, whose threatening words were like a sword; and who was protected lest his grandfather kill him, and was preserved like a chosen arrow for the appointed time. Or of Christ, whose word of preaching is a sword penetrating hearts; who was protected from the weakness of the flesh by the power of his divinity; and who was chosen among all to complete the salvation of the human race.”

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