Eric Metaxas said this quote

“ The author of the hymn 'Amazing Grace', John Newton, who once was a slave ship captain, and who became a Christian preacher and an enemy of the slave trade, once said: 'I have reason to praise [God] for my trials, for, most probably, I should have been ruined without them.' The author of The Gulag Archipelago , Aleksandr Solzhenitsyn, who suffered for twenty years in the hellish prison camps he describes in that book, wrote: 'Bless you prison, bless you for being in my life. For there, lying upon the rotting prison straw, I came to realize that the object of life is not prosperity as we are made to believe, but the maturity of the human soul.' This does not mean that Newton would have chosen to go through his trials, or that Solzhenitsyn in any way enjoyed the terrible suffering of his imprisonment. But it means that in retrospect they can see that God used those difficulties to bless them in the long run. ”