This diagram illustrates as well as any a humanist conception of human virtues. It establishes a series of parallels between incremental states of being in nature, with its correponding verb, and their counterpart in the human condition. Thus simply exist (Est), like a stone, is to be like a sluggard; to merely live (Vivit), like a plant, corresponds to a life of gluttony; to merely feel (Sensit), as a horse can, is to be nothing more than a vain person (Sensualis), to live by the dictates of Luxuria; but to understand (Intellegit), is a human does or ought to, is live as a scholar. The summit of human possibility, in short, is to live the life of the mind. This was the framework for Bouelles study of the human condition, Liber de sapiente, published in 1510.