This is an excerpt from CS Lewis’s The Great Divorce, where an embittered ghost is arguing with the redeemed spirit of her brother:
‘It’s a lie. A wicked, cruel lie. How could anyone love their son more than I did? Haven’t I lived only for his memory all these years?’‘That was rather a mistake, Pam. In your heart of hearts you know it was.’‘What was a mistake?’‘All that ten years’ ritual of grief. Keeping his room exactly as he’d left it; keeping anniversaries; refusing to leave that house though Dick and Muriel were both wretched there.’‘Of course they didn’t care. I know that. I soon learned to expect no real sympathy from them.’‘You’re wrong. No man ever felt his son’s death more than Dick. Not many girls loved their brothers better than Muriel. It wasn’t against Michael they revolted: it was against you—against having their whole life dominated by the tyranny of the past: and not really even Michael’s past, but your past.’‘You are heartless. Everyone is heartless. The past was all I had.’‘It was all you chose to have. It was the wrong way to deal with a sorrow. It was Egyptian—like embalming a dead body.’‘Oh, of course. I’m wrong. Everything I say or do is wrong, according to you.’‘But of course!’ said the Spirit, shining with love and mirth so that my eyes were dazzled. ‘That’s what we all find when we reach this country. We’ve all been wrong! That’s the great joke. There’s no need to go on pretending one was right! After that we begin living.’
Bitterness is a prison house you lock yourself in while you curse those who beckon you to use the keys you have in your hand. The keys aren’t labeled but they look a lot like repentance unto joy.