John Gill Commentary Matthew 6:22

"The lamp of the body is the eye: if therefore thine eye be single, thy whole body shall be full of light." — Matthew 6:22 (ASV)

The light of the body is the eye
Or, the "candle of the body is the eye"; for the eye is that in the body, as a candle is in the house; by the light of it, the several members of the body perform their office; and what is said of the eye of the body, is transferred to the eye of the mind:

if therefore your eye be single :
that is, if your mind be liberal, generous, and bountiful: for Christ is still upon the same subject of liberality, and against covetousness; and here speaks entirely in the language of the Jews, who could easily understand him;

in whose writings we read of three sorts of eyes; a good eye, a middling one, and an evil one; so in the offerings of the first fruits ^F19 ,``(hpy Nye) , "a good eye" gave the fortieth, the house Shammai say, the thirtieth part; a middling one, the fiftieth; and an evil one, the sixtieth part.'' Upon which the commentators say ^F20 , a "good eye" means one that is liberal, and an "evil eye" the contrary:

hence you often read ^F21 of "trading, dedicating", and "giving with a good" or "an evil eye"; that is, either generously, liberally, or in a niggardly and grudging manner; which may help us to the sense of our Lord in these words; whose meaning is, that if a man is not covetous, but his mind is disposed to generosity and liberality; if this be the case, as if he should say,

your whole body shall be full of light :
all your actions will be influenced by this noble principle; your whole life will be illuminated, guided and governed by it; your mind will be cheerful and pleasant, and your estate and condition will be prosperous and successful.

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FOOTNOTES:

• F19: Misn. Trumot, c. 4. sect. 3.
• F20: Maimon. Bartenora & Ez. Chayim in ib.
• F21: T. Bab. Bava Bathra, fol. 37. 2. & 71. 1. & 72. 1.