The light of the body is the eye: if therefore thine eye be single, thy whole body shall be full of light. But if thine eye be evil, thy whole body shall be full of darkness. If therefore the light that is in thee be darkness, how great is that darkness!
(Matthew 6:22,23)

No man, when he hath lighted a candle, putteth it in a secret place, neither under a bushel, but on a candlestick, that they which come in may see the light. 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. Take heed therefore that the light which is in thee be not darkness. If thy whole body therefore be full of light, having no part dark, the whole shall be full of light, as when the bright shining of a candle doth give thee light.
(Luke 11:33-36)

And herein do I exercise myself, to have always a conscience void of offence toward God, and toward men.
(Acts 24:16)

But when ye sin so against the brethren, and wound their weak conscience, ye sin against Christ.
(1 Corinthians 8:12)

If any of them that believe not bid you to a feast, and ye be disposed to go; whatsoever is set before you, eat, asking no question for conscience sake. But if any man say unto you, This is offered in sacrifice unto idols, eat not for his sake that shewed it, and for conscience sake: for the earth is the Lord's, and the fulness thereof: Conscience, I say, not thine own, but of the other: for why is my liberty judged of another man's conscience? For if I by grace be a partaker, why am I evil spoken of for that for which I give thanks? Whether therefore ye eat, or drink, or whatsoever ye do, do all to the glory of God. Give none offence, neither to the Jews, nor to the Gentiles, nor to the church of God:
(1 Corinthians 10:27-32)

Now the end of the commandment is charity out of a pure heart, and of a good conscience, and of faith unfeigned: Holding faith, and a good conscience; which some having put away concerning faith have made shipwreck:
(1 Timothy 1:5,19)

Let us draw near with a true heart in full assurance of faith, having our hearts sprinkled from an evil conscience, and our bodies washed with pure water.
(Hebrews 10:22)

For this is thankworthy, if a man for conscience toward God endure grief, suffering wrongfully.
(1 Peter 2:19)