Wilson's Dictionary of Bible Types
Matthew 6:22 (b) The expression that is used by our Lord in this passage indicates that the individual is occupied only with the glory of GOD, the blessing of the people of GOD, and the growth of the church of GOD. He does not have one eye that looks out for himself, and the other eye which looks out for GOD's interests. (See also Luke 11:34).
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Watson, Walter. Entry for 'Single'. Wilson's Dictoinary of Bible Types. https://www.studylight.org/dictionaries/eng/wdt/s/single.html. 1957.