Neither do men light a lamp, and put it under a bushel, but on a lamp stand; and it gives light unto all that are in the house.
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Augustine of Hippo
AD 430
What view are we to take? That the expression under a bushel measure is so used that only the concealment of the candle is to be understood, as if He were saying, No one lights a candle and conceals it? Or does the bushel measure also mean something, so that to place a candle under a bushel is this, to place the comforts of the body higher than the preaching of the truth; so that one does not preach the truth so long as he is afraid of suffering any annoyance in corporeal and temporal things? And it is well said a bushel measure, whether on account of the recompense of measure, for each one receives the things done in his body—that every one, says the apostle, may there receive the things done in his body; and it is said in another place, as if of this bushel measure of the body, For with what measure ye mete, it shall be measured to you again: — or because temporal good things, which are carried to completion in the body, are both begun and come to an end in a certain definite number ...
This light of the world, city on a mountain, and candle upon a candlestick, signify the Catholic Church, so built upon Christ, the mountain, that it must be visible, and cannot be hidden or unknown. (St. Augustine, cont. Fulg.) Therefore the Church being a candle not under a bushel, but shining to all in the house, i.e. in the world, what shall I say more, saith St. Augustine than that all are blind, who shut their eyes against the candle which is set on the candlestick? (Tract ii. in ep. Jo.)
By this then He declares His own power. In what follows, He requires that boldness of speech which was due on their part; thus saying,
Neither do men light a candle and put it under the bushel, but on the candlestick, and it gives light unto all that are in the house. Let your light so shine before men, that they may see your good works, and glorify your Father which is in Heaven.
For I, says He, it is true, have kindled the light, but its continuing to burn, let that come of your diligence: not for your own sakes alone, but also for their sake, who are to profit by these rays, and to be guided unto the truth. Since the calumnies surely shall not be able to obscure your brightness, if you be still living a strict life, and as becomes those who are to convert the whole world. Show forth therefore a life worthy of His grace; that even as it is everywhere preached, so this light may everywhere accompany the same.
Next He sets before them another sort of gain, besides the salvatio...
. Christ says, "It is I Who have kindled the light in you, but it is for you to labor zealously so that you do not extinguish that grace; in this way, the brightness of your life will shine upon others." He says, therefore: