"All men whom the higher nature has imbued with a love of truth should feel impelled to work for the benefit of future generations, whom they will thereby enrich just as they themselves have been enriched by the labours of their ancestors. Let there be no doubt in the mind of the man who has benefited from the common heritage but does not trouble to contribute to the common good that he is failing sadly in his duty" (Dante Alighieri, De Monarchia I.1)