It is a terrible thing, the burden of living in time that every action we take is ultimately irrevocable. We cannot undo that which we have done.
As Omar Khayyam put it in his poem the Rubaiyat:
The Moving Finger writes; and, having writ, Moves on: nor all thy Piety nor Wit. Shall lure it back to cancel half a Line, Nor all thy Tears wash out a Word of it.
So what sense is there in repentance, in legal justice, when the wrong doing must stand as irrevocable.
It is true, all of our actions are irrevocable.
But the love of God is also irrevocable. He has not, does not, and will not revoke his love.
For if our heart condemn us, God is greater than our heart, and knoweth all things.
1 John 3:20
There is no proper proportion between our sin and his irrevocable love, because there is no proper proportion between the finite and the infinite.
What he once has spoken, he will not unsay.
Therefore we have confidence with him, and if we confess our sins we walk in the light and have fellowship with him. He we agree with God and condemn our wrong doing, we cleave to him and his love. And his love holds us fast and shall not let us go.