"The philosophy of the ancients was the science of differences; and their academies were the seats of confusion and disorder. Aristotle condemned what Plato had taught. Socrates mocked Antisthenes; and Zeno scandalised Epicurus. Pythagoreans, Platonians, Peripatetics, Stoics, Cynics, Epicureans, Sceptics, Cyrenaics, Megarics, Eclectics scuffled with and ridiculed one another; while the truly wise laughed at them all. The people, left to themselves during this hubbub, were not idle, but laboured silently to increase the vast mound of human errors." He ends this Essay with a eulogy of the Christian religion: "To live in the true Church is the only way to combat superstition." Shortly afterwards, increasing knowledge, which Goethe has called "the antipodes of faith," enabled him to perceive that Roman Catholicism, the antidote which he then prescribed for superstition, was itself full charged with the poison he sought to destroy. In 1817 Leopardi made acquaintance by letter with Pietro Giordani, one of the leading literary men of the day, and a man of varied experience and knowledge. In his first letter Leopardi opens his heart to his new friend: "I have very greatly, perhaps immoderately, yearned for glory ... I burn with love for Italy, and thank Heaven that I am an Italian. If I live, I will live for literature; for aught else, I would not live if I could." (21st March 1817.) A month later, from the same source we are able to discern traces of that characteristic of Leopardi's temperament which by certain critics is thought to explain his philosophy. Writing to Giordani, he expatiates on the discomforts of Recanati and its climate; and proceeds:-- "Added to all this is the obstinate, black, and barbarous melancholy which devours and destroys me, which is nourished by study, and yet increases when I forego study. I have in past times had much experience of that sweet sadness which generates fine sentiments, and which, better than joy, may be said to resemble the twilight; but my condition now is like an eternal and horrible night. A poison saps my powers of body and mind."-- In the same letter he gives his opinion on the relative nature of prose and poetry. "Poetry requires infinite study and application, and its art is so profound, that the more you advance in proficiency, so much the further does perfection seem to recede.... To be a good prose writer first, and a poet later, seems to me to be contrary to nature, which first creates the poet, and then by the cooling operation of age concedes the maturity and tranquillity necessary for prose." (30th April 1817.)