„This is how deep truths are winnowed from deep nonsense.“

— Carl Sagan

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„There is a deep power in words that speak the truth“
— P. C. Cast
„Mystical explanations are considered deep; the truth is, they are not even shallow.“
— Friedrich Nietzsche
„The books that help you most are those which make you think the most. The hardest way of learning is that of easy reading; but a great book that comes from a great thinker is a ship of thought, deep freighted with truth and beauty.“
— Pablo Neruda