The first part is largely an historical survey. Using specific examples, Rousseau shows how societies in which the arts and sciences flourished more often than not saw the decline of morality and virtue. He notes that it was after philosophy and the arts flourished that ancient Egypt fell. Similarly, ancient Greece was once founded on notions of heroic virtue, but after the arts and sciences progressed, it became a society based on luxury and leisure. The one exception to this, according to Rousseau, was Sparta, which he praises for pushing the artists and scientists from its walls. Sparta is in stark contrast to Athens, which was the heart of good taste, elegance, and philosophy. Interestingly, Rousseau here discusses Socrates, as one of the few wise Athenians who recognized the corruption that the arts and sciences were bringing about. Rousseau paraphrases Socrates’ famous speech in the Apology. In his address to the court, Socrates says that the artists and philosophers of his day claim to have knowledge of piety, goodness, and virtue, yet they do not really understand anything. Rousseau’s historical inductions are not limited to ancient civilizations, however, as he also mentions China as a learned civilization that suffers terribly from its vices.
The second part of the First Discourse is an examination of the arts and sciences themselves, and the dangers they bring. First, Rousseau claims that the arts and sciences are born from our vices: “Astronomy was born from superstition; eloquence from ambition, hate, flattery, and falsehood; geometry from avarice, physics from vain curiosity; all, even moral philosophy, from human pride.” (First Discourse, Vol. I, p. 12). The attack on sciences continues as Rousseau articulates how they fail to contribute anything positive to morality. They take time from the activities that are truly important, such as love of country, friends, and the unfortunate. Philosophical and scientific knowledge of subjects such as the relationship of the mind to the body, the orbit of the planets, and physical laws that govern particles fail to genuinely provide any guidance for making people more virtuous citizens. Rather, Rousseau argues that they create a false sense of need for luxury, so that science becomes simply a means for making our lives easier and more pleasurable, but not morally better.
The arts are the subject of similar attacks in the second part of the First Discourse. Artists, Rousseau says, wish first and foremost to be applauded. Their work comes from a sense of wanting to be praised as superior to others. Society begins to emphasize specialized talents rather than virtues such as courage, generosity, and temperance. This leads to yet another danger: the decline of military virtue, which is necessary for a society to defend itself against aggressors. And yet, after all of these attacks, the First Discourse ends with the praise of some very wise thinkers, among them, Bacon, Descartes, and Newton. These men were carried by their vast genius and were able to avoid corruption. However, Rousseau says, they are exceptions; and the great majority of people ought to focus their energies on improving their characters, rather than advancing the ideals of the Enlightenment in the arts and sciences.