Et Posuit Os Meum Ut Gladium Acutum

The Introit from today's Mass of the Feast of the Nativity of St. John the Baptist:

De ventre matris meæ vocávit me Dóminus nómine meo: et pósuit os meum ut gládium acútum: sub teguménto manus suæ protexit me, et pósuit me quasi sagíttam eléctam. Bonum est confitéri Dómino: et psállere nómini tuo, Altíssime.

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From the womb of my mother the Lord hath called me by my name, 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. It is good to give praise to the Lord, and to sing to Thy name, O Most High.

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Fr. Z's commentary and podcast on today's feast of the Nativity of St. John the Baptist.