"[I was advised] to read Jordan's 'Cours d'analyse'; and I shall never forget the astonishment with which I read that remarkable work, the first inspiration for so many mathematicians of my generation, and learnt for the first time as I read it what mathematics really meant."

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It was only when I lay there on the rotting prison straw that I sensed within myself the first stirrings of good. Gradually it was disclosed to me that the line separating good and evil passes not between states nor between social classes nor between political parties, but right through every human heart, through all human hearts. And that is why I turn back to the years of my imprisonment and say, sometimes to the astonishment of those about me, bless you, prison, for having been a part of my life.

— Aleksandr Solzhenitsyn