אמר ריש לקיש גדולה תשובה שזדונות נעשות לו כשגגות שנאמר (הושע יד, ב) שובה ישראל עד ה' אלהיך כי כשלת בעונך הא עון מזיד הוא וקא קרי ליה מכשול איני והאמר ריש לקיש גדולה תשובה שזדונות נעשות לו כזכיות שנאמר (יחזקאל לג, יט) ובשוב רשע מרשעתו ועשה משפט וצדקה עליהם (חיה) יחיה לא קשיא כאן מאהבה כאן מיראה
יומא פו ב
ר"ש בן יוחי אומר אפילו צדיק גמור כל ימיו ומרד באחרונה איבד את הראשונות שנאמר(יחזקאל לג, יב) צדקת הצדיק לא תצילנו ביום פשעו ואפילו רשע גמור כל ימיו ועשה תשובה באחרונה אין מזכירים לו שוב רשעו שנאמר (יחזקאל לג, יב) ורשעת הרשע לא יכשל בה ביום שובו מרשעו וניהוי כמחצה עונות ומחצה זכיות אמר ריש לקיש בתוהא על הראשונות
קידושין מ ב
The Great Divorce by C.S. Lewis:
BLAKE WROTE the Marriage of Heaven and Hell. If I have written of their Divorce, this is not because I think myself a fit antagonist for so great a genius, nor even because I feel at all sure that I know what he meant. But in some sense or other the attempt to make that marriage is perennial. The attempt is based on the belief that reality never presents us with an absolutely unavoidable "either-or"; that, granted skill and patience and (above all) time enough, some way of embracing both alternatives can always be found; that mere development or adjustment or refinement will somehow turn evil into good without our being called on for a final and total rejection of anything we should like to retain. This belief I take to be a disastrous error. You cannot take all luggage with you on all journeys; on one journey even your right hand and your right eye may be among the things you have to leave behind. We are not living in a world where all roads are radii of a circle and where all, if followed long enough, will therefore draw gradually nearer and finally meet at the centre: rather in a world where every road, after a few miles, forks into two, and each of those into two again, and at each fork you must make a decision. Even on the biological level life is not like a pool but like a tree. It does not move towards unity but away from it and the creatures grow further apart as they increase in perfection. Good, as it ripens, becomes continually more different not only from evil but from other good.
I do not think that all who choose wrong roads perish; but their rescue consists in being put back on the right road. A wrong sum can be put right: but only by going back till you find the error and working it afresh from that point, never by simply going on. Evil can be undone, but it cannot "develop" into good. Time does not heal it. The spell must be unwound, bit by bit, "with backward mutters of dissevering power"-or else not. It is still "either-or." If we insist on keeping Hell (or even earth) we shall not see Heaven: if we accept Heaven we shall not be able to retain even the smallest and most intimate souvenirs of Hell. I believe, to be sure, that any man who reaches Heaven will find that what he abandoned (even in plucking out his right eye) was precisely nothing: that the kernel of what he was really seeking even in his most depraved wishes will be there, beyond expectation, waiting for him in "the High Countries."
In that sense it will be true for those who have completed the journey (and for no others) to say that good is everything and Heaven everywhere. But we, at this end of the road, must not try to anticipate that retrospective vision. If we do, we are likely to embrace the false and disastrous converse and fancy that everything is good and everywhere is Heaven.
"But I don't understand. Is judgment not final? Is there really a way out of Hell into Heaven?"
"It depends on the way you're using the words. If they leave that grey town behind it will not have been Hell. To any that leaves it, it is Purgatory. And perhaps ye had better not call this country Heaven. Not Deep Heaven, ye understand." (Here he smiled at me). "Ye can call it the Valley of the Shadow of Life. And yet to those who stay here it will have been Heaven from the first. And ye can call those sad streets in the town yonder the Valley of the Shadow of Death: but to those who remain there they will have been Hell even from the beginning."
I suppose he saw that I looked puzzled, for presently he spoke again.
"Son," he said, "ye cannot in your present state understand eternity: when Anodos looked through the door of the Timeless, he brought no message back. But ye can get some likeness of it if ye say that both good and evil, when they are full grown, become retrospective. Not only this valley but all this earthly past will have been Heaven to those who are saved. Not only the twilight in that town, but all their life on earth too, will then be seen by the damned to have been Hell. That is what mortals misunderstand. They say of some temporal suffering, 'No future bliss can make up for it,' not knowing that Heaven, once attained, will work backwards and turn even that agony into a glory. And of some sinful pleasure they say 'Let me but have this and I'll take the consequences': little dreaming how damnation will spread back and back into their past and contaminate the pleasure of the sin. Both processes begin even before death. The good man's past begins to change so that his forgiven sins and remembered sorrows take on the quality of Heaven: the bad man's past already conforms to his badness and is filled only with dreariness. And that is why, at the end of all things, when the sun rises here and the twilight turns to blackness down there, the Blessed will say, 'We have never lived anywhere except in Heaven,' and the Lost, 'We were always in Hell.'