Ashes to Righteousness

When Job and Isaiah saw God, they each gained profound moral insight about Him, and therefore about themselves.  

For Isaiah, it was the dirty mouth speaking from a dirty heart:

See Isaiah 6:1-8

For Job it was his presumption that he could understand the ways of God:

See Job 42:1-8

In each case, these self-accusations of weakness and depravity are regarded by God to be truth-speaking.  As a consequence, these men are immediately put into greater service to God:  Isaiah as a greater prophet, and Job as priest for his friends who have spoken so brazenly and self-confidently to Job about God's ways.

See:

42:1 Then Job answered the Lord and said:

² “I know that You can do everything,
And that no purpose of Yours can be withheld from You.
³ You asked, ‘Who is this who hides counsel without knowledge?’
Therefore I have uttered what I did not understand,
Things too wonderful for me, which I did not know.
⁴ Listen, please, and let me speak;
You said, ‘I will question you, and you shall answer Me.’

⁵ I have heard of You by the hearing of the ear,
But now my eye sees You.
⁶ Therefore I abhor myself,
And repent in dust and ashes.”

⁷ And so it was, after the Lord had spoken these words to Job, that the Lord said to Eliphaz the Temanite, “My wrath is aroused against you and your two friends, for you have not spoken of Me what is right, as My servant Job has.

So, repenting in dust and ashes at the vision of God is the act of persons whom God calls righteous.