The Differences Between a Mathematician and a Natural Philosopher

Everything is said to be when it is form in energy, in telechia, rather than when it is in capacity. Nature does not thus subsist with respect to nature, but that which is born proceeds or takes its beginning from something to something. We must also consider whether astrology, i.e. astronomy, is different from or a part of physics. For natural bodies have superficial ease and solidities, lengths and points about which the mathematician speculates.