"My encounter with another world and another culture and the beginnings of an attachment to them had set up an irritation, barely perceptible but incurable-rather like unrequited love, like a symptom of the hopelessness of trying to grasp what is boundless, or unite what cannot be joined; a reminder of how finite, how curtailed, our experience on earth must be"

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That intense faith in another world, that intense hatred for this world, that intense power of renunciation, that intense faith in God, that intense faith in the immortal soul, is in you. I challenge anyone to give it up. You cannot. You may try to impose upon me by becoming materialists, by talking materialism for a few months, but I know what you are; if I take you by the hand, back you come as good theists as ever were born. How can you change your nature?

— Swami Vivekananda