"You don't have to take drugs to be happy. You don't have to drink to be happy. You don't have to have people around you who love you to be happy. You don't need anything except the clarity of your own mind."

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It appeared that after first contemplating a book on some subject, and after giving serious preliminary attention to it, I needed a period of subconscious incubation which could not be hurried and was if anything impeded by deliberate thinking.... Having, by a time of very intense concentration, planted the problem in my subconsciousness, it would germinate underground until, suddenly, the solution emerged with a blinding clarity, so that it only remained to write down what happened as if in a revelation.

— Bertrand Russell