Sophie Germain thought that if the geometry method, which at that time referred to all of pure mathematics, could hold such fascination for Archimedes, it was a subject worthy of study. So she pored over every book on mathematics in her father's library, even teaching herself Latin and Greek, so she could read works like those of Sir Isaac Newton and Leonhard Euler. She also enjoyed by Étienne Bézout and by Jacques Antoine-Joseph Cousin. Later, Cousin visited Germain at home, encouraging her in her studies.