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Our inward power, when it obeys nature, reacts to events by accommodating itself to what it faces - to what is possible. It needs no specific material. It pursues its own aims as circumstances allow; it turns obstacles into fuel. As a fire overwhelms what would have quenched a lamp. What's thrown on top of the conflagration is absorbed, consumed by it - and makes it burn still higher.

Marcus Aurelius (2002). “Meditations: A New Translation”, p.37, Modern Library
Our inward power, when it obeys nature, reacts to events by accommodating itself to what it faces - to what is possible. It needs no specific material. It pursues its own aims as circumstances allow; it turns obstacles