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is not possible for there to be another earth than this one, since every earth would naturally be carried to this central one, wherever it was. The same applies to the other bodies which are part of the world.
QUESTION 48
THE DISTINCTION OF THINGS IN PARTICULAR (In Six Articles)
We must now consider the distinction of things in particular; and firstly the distinction of good and evil; and then the distinction of the spiritual and corporeal creatures.
Concerning the first, we inquire into evil and its cause.
Concerning evil, six points are to be considered:
(1) Whether evil is a nature?
(2) Whether evil is found in things?
(3) Whether good is the subject of evil?
(4) Whether evil totally corrupts good?
(5) The division of evil into pain and fault.
(6) Whether pain, or fault, has more the nature of evil?
FIRST ARTICLE [I, Q. 48, Art. 1]
Whether Evil Is a Nature?
Objection 1: It would seem that evil is a nature. For every genus is a nature. But evil is a genus; for the Philosopher says (Praedic. x) that "good and evil are not in a genus, but are genera of other things." Therefore evil is a nature.
Obj. 2: Further, every difference which constitutes a species is a nature. But evil is a difference constituting a species of morality; for a bad habit differs in species from a good habit, as liberality from illiberality. Therefore evil signifies a nature.
Obj. 3: Further, each extreme of two contraries is a nature. But evil and good are not opposed as privation and habit, but as contraries, as the