"Most of what I know about environmental conservation I learned from my father, who has been a leader within the movement for over 30 years."

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Nothing remains intact without effort. Repetition of formulas does not assure the transmission of thought. It is not safe to entrust a doctrinal treasure to the passivity of memory. Intelligence must play a part in its conservation, rediscovering it, so to speak, in the process.

— Henri de Lubac