4p31d.md (497B)
1 In so far as a thing is in harmony with our nature, it 2 cannot be bad for it. It will therefore necessarily be either 3 good or indifferent. If it be assumed that it be neither good 4 nor bad, nothing will follow from its nature (IV. Def. i.), which 5 tends to the preservation of our nature, that is (by the 6 hypothesis), which tends to the preservation of the thing itself; 7 but this (III. vi.) is absurd; therefore, in so far as a thing 8 is in harmony with our nature, it is necessarily good. Q.E.D. 9 10