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Math:

"Mathmatics is one of the essential emanations of the human spirit,- a thing to be valued in and for its self, like art or poetry"

"Darkness cannot drive out darkness; only light can do that. Hate cannot drive out hate; only love can do that."

"The most incomprehensible thing about the world is that it is comprehensible."

"Love is a fire. But whether it is going to warm your heart or burn down your house, you can never tell."