“The light of the body is the eye: if therefore thine eye be single, thy whole body shall be full of light.”
King James Version (KJV)
6:22 The eye is the lamp of the body - And what the eye is to the body, the intention is to the soul. We may observe with what exact propriety our Lord places purity of intention between worldly desires and worldly cares, either of which directly tend to destroy. If thine eye be single - Singly fixed on God and heaven, thy whole soul will be full of holiness and happiness. If thine eye be evil - Not single, aiming at any thing else.
Mt 6:22,23 The light of the body is the eye. This is not an abrupt transition, but bears on the same subject. If one's eye is diseased, all he sees is wrong. So the mind, or conscience, is the light of the soul. If these be darkened, all is darkness; if these see aright, all is light.