„A man is as old as his arteries, and as young as his ideas.“

— Will Durant

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„The kind of man who wants the government to adopt and enforce his ideas is always the kind of man whose ideas are idiotic.“
— H.L. Mencken
„There was no God in his heart, he knew; his ideas were still in riot; there was ever the pain of memory; the regret for his lost youth — yet the waters of disillusion had left a deposit on his soul, responsibility and a love of life, the faint stirring of old ambitions and unrealized dreams.“
— F. Scott Fitzgerald
„Everyone sits in the prison of his own ideas; he must burst it open, and that in his youth, and so try to test his ideas on reality.“
— Albert Einstein
„It's amazing that a man who is dead can talk to people through these pages. As long as this books survives, his ideas live.“
— Christopher Paolini
„The key to every man is his thought. Sturdy and defying though he look, he has a helm which he obeys, which is the idea after which all his facts are classified. He can only be reformed by showing him a new idea which commands his own.“
— Ralph Waldo Emerson
„Perhaps a man really dies when his brain stops, when he loses the power to take in a new idea.“
— George Orwell