Tell her to stop taking the verse out of context, like Martin Luther did when just coming up with his novel idea of *imputed * righteousness (God gives us his righteousness) as opposed what Christians had always believed before then, *infused * righteousness (God actually making you holy, with your cooperation). Her’s is a typical Fundamentalist practice of building an entire theology upon a single verse.
Show her the idea that men cannot be righteous is unbiblical as these verses show:
**Mt 10:41 -
He who receives a prophet because he is a prophet shall receive a prophet’s reward, and he who receives a righteous man because he is a righteous man shall receive a righteous man’s reward.
Mt 13:43 -
Then the righteous will shine like the sun in the kingdom of their Father. He who has ears, let him hear.
Mt 13:49 -
So it will be at the close of the age. The angels will come out and separate the evil from the righteous,
Mt 25:46 -
And they will go away into eternal punishment, but the righteous into eternal life."
Mt 27:19 -
Besides, while he was sitting on the judgment seat, his wife sent word to him, “Have nothing to do with that righteous man, for I have suffered much over him today in a dream.”
Mr 6:20 -
for Herod feared John, knowing that he was a righteous and holy man, and kept him safe. When he heard him, he was much perplexed; and yet he heard him gladly.
Lu 1:6 -
And they were both righteous before God, walking in all the commandments and ordinances of the Lord blameless.
Lu 2:25 -
Now there was a man in Jerusalem, whose name was Simeon, and this man was righteous and devout, looking for the consolation of Israel, and the Holy Spirit was upon him.
What does it mean to be righteous? Look at Matthew 25, where Jesus describes the righteous as those who do good works:
Mt 25:37 -
Then the righteous will answer him, 'Lord, when did we see thee hungry and feed thee, or thirsty and give thee drink? **
Even Jesus is referred to as righteous:
**Mt 27:19 -
Besides, while he was sitting on the judgment seat, his wife sent word to him, “Have nothing to do with that righteous man, for I have suffered much over him today in a dream.” **
The examples could be multiplied.
The passage in Isaiah which she is mangling, placed properly in context, is explicitly addressed to those in Isaiah’s time who were not sincerely following God. Thus their deeds were as filthy rags because they covered up their false hearts. Read it for your self and for her.
**Isaiah 64: 1 - 12 **
1 Oh that thou wouldest rend the heavens, that thou wouldest come down, that the mountains might flow down at thy presence, 2 As when the melting fire burneth, the fire causeth the waters to boil, to make thy name known to thine adversaries, that the nations may tremble at thy presence! 3 When thou didst terrible things which we looked not for, thou camest down, the mountains flowed down at thy presence. 4 For since the beginning of the world men have not heard, nor perceived by the ear, neither hath the eye seen, O God, beside thee, what he hath prepared for him that waiteth for him. 5 Thou meetest him that rejoiceth and worketh righteousness, those that remember thee in thy ways: behold, thou art wroth; for we have sinned: in those is continuance, and we shall be saved.
6 But we are all as an unclean thing, and all our righteousnesses are as filthy rags; and we all do fade as a leaf; and our iniquities, like the wind, have taken us away. 7 And there is none that calleth upon thy name, that stirreth up himself to take hold of thee: for thou hast hid thy face from us, and hast consumed us, because of our iniquities. 8 But now, O LORD, thou art our father; we are the clay, and thou our potter; and we all are the work of thy hand. 9 Be not wroth very sore, O LORD, neither remember iniquity for ever: behold, see, we beseech thee, we are all thy people. 10 Thy holy cities are a wilderness, Zion is a wilderness, Jerusalem a desolation. 11 Our holy and our beautiful house, where our fathers praised thee, is burned up with fire: and all our pleasant things are laid waste. 12 Wilt thou refrain thyself for these things, O LORD? wilt thou hold thy peace, and afflict us very sore?
Any verse taken out of context is a pretense.