Luke 11:34

The lamp of the body is the eye. When your eyesight is good, your whole body also is lighted up; but when it is defective, your body is darkened.

Matthew 6:22-23

"The eye is the lamp of the body. If then your eyesight is good, your whole body will be well lighted;

Mark 4:12

that "'They may look and look but not see, and listen and listen but not understand, lest perchance they should return and be pardoned.'"

Mark 7:22

covetousness, wickedness, deceit, licentiousness, envy, reviling, pride, reckless folly:

Mark 8:18

You have eyes! can you not see? You have ears! can you not hear? and have you no memory?

Acts 2:46

And, day by day, attending constantly in the Temple with one accord, and breaking bread in private houses, they took their meals with great happiness and single-heartedness,

Acts 13:11

The Lord's hand is now upon you, and you will be blind for a time and unable to see the light of day." Instantly there fell upon him a mist and a darkness, and, as he walked about, he begged people to lead him by the hand.

Acts 26:18

that they may turn from darkness to light and from the obedience to Satan to God, in order to receive forgiveness of sins and an inheritance among those who are sanctified through faith in Me.'

Romans 11:8-10

And so Scripture says, "God has given them a spirit of drowsiness--eyes to see nothing with and ears to hear nothing with--even until now."

2 Corinthians 1:12

For the reason for our boasting is this--the testimony of our own conscience that it was in holiness and with pure motives before God, and in reliance not on worldly wisdom but on the gracious help of God, that we have conducted ourselves in the world, and above all in our relations with you.

2 Corinthians 4:4

in whom the god of this present age has blinded their unbelieving minds so as to shut out the sunshine of the Good News of the glory of the Christ, who is the image of God.

2 Corinthians 11:3

But I am afraid that, as the serpent in his craftiness deceived Eve, so your minds may be led astray from their single-heartedness and their fidelity to Christ.

Ephesians 1:17

For I always beseech the God of our Lord Jesus Christ--the Father most glorious--to give you a spirit of wisdom and penetration through an intimate knowledge of Him,

Ephesians 6:5

Slaves, be obedient to your earthly masters, with respect and eager anxiety to please and with simplicity of motive as if you were obeying Christ.

Colossians 3:22

Slaves, be obedient in everything to your earthly masters; not in acts of eye service, as aiming only to please men, but with simplicity of purpose, because you fear the Lord.

2 Thessalonians 2:9-12

The appearing of the Lawless one will be attended by various miracles and tokens and delusive marvels--for so Satan works--

Treasury of Scripture Knowledge

Summary

The light of the body is the eye: therefore when thine eye is single, thy whole body also is full of light; but when thine eye is evil, thy body also is full of darkness.

Bible References

Light of

Matthew 6:22
"The eye is the lamp of the body. If then your eyesight is good, your whole body will be well lighted;
Mark 8:18
You have eyes! can you not see? You have ears! can you not hear? and have you no memory?
Acts 26:18
that they may turn from darkness to light and from the obedience to Satan to God, in order to receive forgiveness of sins and an inheritance among those who are sanctified through faith in Me.'
Ephesians 1:17
For I always beseech the God of our Lord Jesus Christ--the Father most glorious--to give you a spirit of wisdom and penetration through an intimate knowledge of Him,

Single

Acts 2:46
And, day by day, attending constantly in the Temple with one accord, and breaking bread in private houses, they took their meals with great happiness and single-heartedness,
2 Corinthians 1:12
For the reason for our boasting is this--the testimony of our own conscience that it was in holiness and with pure motives before God, and in reliance not on worldly wisdom but on the gracious help of God, that we have conducted ourselves in the world, and above all in our relations with you.
2 Corinthians 11:3
But I am afraid that, as the serpent in his craftiness deceived Eve, so your minds may be led astray from their single-heartedness and their fidelity to Christ.
Ephesians 6:5
Slaves, be obedient to your earthly masters, with respect and eager anxiety to please and with simplicity of motive as if you were obeying Christ.
Colossians 3:22
Slaves, be obedient in everything to your earthly masters; not in acts of eye service, as aiming only to please men, but with simplicity of purpose, because you fear the Lord.

But

Mark 4:12
that "'They may look and look but not see, and listen and listen but not understand, lest perchance they should return and be pardoned.'"
Mark 7:22
covetousness, wickedness, deceit, licentiousness, envy, reviling, pride, reckless folly:
Acts 13:11
The Lord's hand is now upon you, and you will be blind for a time and unable to see the light of day." Instantly there fell upon him a mist and a darkness, and, as he walked about, he begged people to lead him by the hand.
Romans 11:8
And so Scripture says, "God has given them a spirit of drowsiness--eyes to see nothing with and ears to hear nothing with--even until now."
2 Corinthians 4:4
in whom the god of this present age has blinded their unbelieving minds so as to shut out the sunshine of the Good News of the glory of the Christ, who is the image of God.
2 Thessalonians 2:9
The appearing of the Lawless one will be attended by various miracles and tokens and delusive marvels--for so Satan works--