„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

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„Everyone is in love with his own ideas“
— C.G. Jung
„Everyone seems to have a clear idea of how other people should lead their lives, but none about his or her own.“
— Paulo Coelho
„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
„Mandela taught us the power of action, but he also taught us the power of ideas; the importance of reason and arguments; the need to study not only those who you agree with, but also those who you don’t agree with. He understood that ideas cannot be contained by prison walls, or extinguished by a sniper’s bullet. He turned his trial into an indictment of apartheid because of his eloquence and his passion, but also because of his training as an advocate. He used decades in prison to sharpen his arguments, but also to spread his thirst for knowledge to others in the movement. And he learned the language and the customs of his oppressor so that one day he might better convey to them how their own freedom depend upon his.“
— Barack Obama
„Everyone has his own reality in which, if one is not too cautious, timid or frightened, one swims. This is the only reality there is.“
— Henry Miller
„A man is as old as his arteries, and as young as his ideas.“
— Will Durant
„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