Underneath his sweetness and gentleness was the heat of a volcano. He was a man of excitable and fiery nature; but through high self-discipline he had converted the fire into a central glow and motive power of life, instead of permitting it to waste itself in useless passion.

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Quote text and notes from Wikiquote: John Tyndall (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.