Vow, and pay unto the LORD your God: let all that be round about him bring presents unto him that ought to be feared.
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Augustine of Hippo
11. "Vow ye, and pay to the Lord our God" (ver. 11). Let each man vow what he is able, and pay it. Do not vow and not pay: but let every man vow, and pay what he can. Be ye not slow to vow: for ye will accomplish the vows by powers not your own. Ye will fail, if on yourselves ye rely: but if on Him to whom ye vow ye rely, ye will be safe to pay. "Vow ye, and pay to the Lord our God." What ought we all in common to vow? To believe in Him, to hope from Him for life eternal, to live godly according to a measure common to all. For there is a certain measure common to all men.To commit no theft is not a thing enjoined merely upon one devoted to continence, and not enjoined upon the married woman: to commit no adultery is enjoined upon all men: not to love wine-bibbing, whereby the soul is swallowed up, and doth corrupt in herself the Temple of God, is enjoined to all alike: not to be proud, is enjoined to all men alike: not to slay man, not to hate a brother, not to lay a plot to destroy an...
God. Victims of thanksgiving, as was customary after a victory, Psalm xxi., xxvi., xlix., and xiv. He speaks to the people who had been spared, particularly to the priests, though it may be understood also of foreign nations, who complied with this invitation, 2 Paralipomenon xxxii. 22. (Calmet)
Vows, and their completion, ought not to be separated, even though the thing vowed may have been before a matter of choice, as virginity (St. Augustine) (Berthier)
What says Luther? (Haydock)