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Proverbs 31:18
She perceiveth that her merchandise is good: her candle goeth not out by night. (Proverbs 31:18)
Goeth not out.
 The lamp burned all night in a well-ordered Eastern home and was extinguished only in times of calamity (see Job 18:6; Prov. 13:9; Jer. 25:10).
She perceiveth.
By investigation she makes sure that her activities are profitable.