Quilibet uniuscujusque individui affectus ab affectu alterius tantum discrepat quantum essentia unius ab essentia alterius differt.
English (Elwes 1883)
Any emotion of a given individual differs from the emotion of another individual, only in so far as the essence of the one individual differs from the essence of the other.
Modern English
Any affect of a given individual differs from the affect of another individual only insofar as the essence of the one individual differs from the essence of the other.