Friends,--Every one in particular, who are of God, and not of the world, walk out of the world's vain customs, ordinances, and commands; and stand a witness against them all, in the testimony of Jesus, and witness him the substance of all, waiting in the light of God, and walking in it, then will ye have unity one with another, and the blood of Jesus Christ will cleanse you from all sin; for through it and by it we do overcome; which blood of the new covenant is but one. There shall ye witness the lamb of God, that takes away the sins of the world. Oh! wait all in that which is pure, to be fed alone of God with the eternal, living food! Go not out among the swine, who feed upon the outside, the husk, among the merchants of Babylon, and so forsake the living bread; but as ye have received Christ Jesus, in him walk…
(Fox letter XV, 1652)

But the light within, which doth convince thee, will show thee, when the mind goeth forth; and show thee the daily cross, which is to crucify that carnal mind; for the carnal mind minds carnal things; and the cross is to the will of man, for it shall never enter. (Fox letter XIX, 1652)

Romans 6:3-8, 11 Know ye not, that so many of us as were baptized into Jesus Christ were baptized into his death? Therefore we are buried with him by baptism into death: that like as Christ was raised up from the dead by the glory of the Father, even so we also should walk in newness of life. For if we have been planted together in the likeness of his death, we shall be also in the likeness of his resurrection. Knowing this, that our old man is crucified with him, that the body of sin might be destroyed, that henceforth we should not serve sin. For he that is dead is freed from sin. Now if we be dead with Christ, we believe that we shall also live with him…. Likewise reckon ye also yourselves to be dead indeed unto sin, but alive unto God through Jesus Christ our Lord.
Galatians 2:20 I am crucified with Christ: nevertheless, I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave himself for me.
Colossians 3:1-2 If ye then be risen with Christ, seek those things which are above, where Christ sitteth on the right hand of God. Set your affection on things above, not on things on the earth.
Luke 9:18-24 And it came to pass, as he was alone praying, his disciples were with him: and he asked them, saying, Whom say the people that I am? They answering said, John the Baptist; but some say, Elias; and others say, that one of the old prophets is risen again. He said unto them, But whom say ye that I am? Peter answering said, The Christ of God. And he straitly charged them, and commanded them to tell no man that thing; Saying, The Son of man must suffer many things, and be rejected of the elders and chief priests and scribes, and be slain, and be raised the third day. And he said to them all, If any man will come after me, let him deny himself, and take up his cross daily, and follow me. For whosoever will save his life shall lose it: but whosoever will lose his life for my sake, the same shall save it.

Romans 8:5-14 For they that are after the flesh do mind the things of the flesh; but they that are after the Spirit the things of the Spirit. For to be carnally minded is death; but to be spiritually minded is life and peace. Because the carnal mind is enmity against God: for it is not subject to the law of God, neither indeed can be. So then they that are in the flesh cannot please God. But ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you. Now if any man have not the Spirit of Christ, he is none of his. And if Christ be in you, the body is dead because of sin; but the Spirit is life because of righteousness. But if the Spirit of him that raised up Jesus from the dead dwell in you, he that raised up Christ from the dead shall also quicken your mortal bodies by his Spirit that dwelleth in you. Therefore, brethren, we are debtors, not to the flesh, to live after the flesh. For if ye live after the flesh, ye shall die: but if ye through the Spirit do mortify the deeds of the body, ye shall live. For as many as are led by the Spirit of God, they are the sons of God.

Turning to the Light gives people a new talk AND a new walk.
Early Friends saw themselves as fellow witnesses with the biblical prophets and apostles, with those who wrote and preserved the words of the Bible, and with the Bible itself, testifying in word and action to the truth of the gospel. Their words and actions are meant to turn people inward to Christ, to receive God's testimony in our hearts.