„Only knowledge that is used sticks in your mind.“

— Dale Carnegie

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„Live in the Moment", "Empty Your Mind of the Trash"Wisdom is the Use of Knowledge“
— Dan Millman
„You can become a Communist only when you enrich your mind with a knowledge of all the treasures created by mankind.“
— Vladimir Lenin
„So you must ask this question, put this question to yourself, whether your mind can be empty of all its past and yet retain the technological knowledge, your engineering knowledge, your linguistic knowledge, the memory of all that, and yet function from a mind that is completely empty.“
— Jiddu Krishnamurti
„It is not time that changes man nor knowledge the only thing that can change someone's mind is love.“
— Paulo Coelho
„Anger has its place, but it will not serve you here, the way of the warrior is the way of knowing. Of that knowledge requires you to use anger, then you use anger, but you cannot wrest forth knowledge by losing your temper.“
— Christopher Paolini
„My practicality consists in this: in the knowledge that if you beat your head against the wall it is your head which breaks and not the wall … that is my strength, my only strength.“
— Antonio Gramsci