Each wanting thatch of hair upon his head Was once a clerk, or pope, or cardinal, In whom abound the ripest growths of greed.’
This sections speaks into how green plays into how even the most "honorable" people in high positions all fell to the sin of greed. Some scholars define greed as "Greed begins in the mind and it ends as a corruption of the qualities which the mind values most" (Freedman, 171). This can be interpreted by how people in these high religious positions, like a clerk or a pope, can be corrupted with power and end up as greedy people. Furthermore, greed as a sin can be a harder one to overcome since it is a harder one to recognize, as most people (especially religious people), end up negating the fact that they, too, are affected by greed.
Freedman, L. (2009). The Narrative of Consumption: Greed and Literature. In: Brassey, A., Barber, S. (eds) Greed. Palgrave Macmillan, London. https://doi.org/10.1057/9780230246157_12