Matthew 6:22 is the twenty-second verse of the sixth chapter of the Gospel of Matthew in the New Testament, and is part of the Sermon on the Mount.
In the King James Version of the Bible the text reads:
The World English Bible translates the passage as:
For a collection of other versions see here: Matthew 6:22
The Greek: λυχνος, lychnos, is generally translated as "lamp", but in the King James Version, the Geneva Bible and Calvin's Commentary it was translated as "light".
By lamp, this verse may mean that the eye is a metaphorical window by which light enters the body. Alternatively the lamp might not be meant as a source of light, but rather as a guide through darkness, just as the eye is a guide through life. In this case the verse is almost certainly speaking of a spiritual eye rather than the literal organ. Harold Fowler suggests that in this verse eye is a metaphor for the conscience and moral vision of the individual, both of which serve and guiding lights.
What is meant by the word ἁπλοῡς, haplous, translated as single in the KJV and sound in the WEB, is uncertain. This term can mean generous, and its opposite in the next verse clearly means miserly. This verse can thus mean one is "full of light" if one's eye, i.e. conscience, is generous. This wording links this verse to the idea of the evil eye, which was often termed the "ungenerous eye". By this interpretation the good spiritual eye is one that is generous and can perceive God, and thus allows illumination into the entire body. However, in the Septuagint, haplous is used to translate the Hebrew term for "singleness of purpose". If the author of Matthew was using this translation this verse would be extolling the eye that is solely focused on one thing, i.e. God. This second interpretation links closely with the neighbouring sections where Jesus is warning his followers not to deviate from their focus on God by concerning themselves with worldly things. Both Fowler and R. T. France speculate that this ambiguity is deliberate, and that the verse is speaking about both generosity and single mindedness, as both ideas are discussed in this part of Jesus' sermon.