«The mediocre painters of Velázquez's time, boiling with envy (that infirmity which is always malnourished because, wrote Quevedo, it "bites, but doesn't eat"), complained to the king that his court painter only knew how to paint human faces. "Is that true?" the king asked Velázquez. "I know of no one who can really paint human faces," was the response. "That is the most difficult of all"» .

These words can only be understood if one does not ignore the spiritual dimension of the human being.