He was the first Academic to adopt a position of philosophical scepticism, that is, he doubted the ability of the senses to discover truth about the world, although he may have continued to believe in the existence of truth itself.
Ia adalah akademik pertama yang mengambil posisi skeptisisme filosofis, yaitu, ia meragukan kemampuan indra untuk menemukan kebenaran tentang dunia, meskipun ia mungkin terus percaya akan adanya kebenaran itu sendiri.