But men are only said to be active, in so far as they act in obedience to reason (III.

iii.); therefore, what so ever follows from human nature in so far as it is defined by reason must (III.Def.

ii.) be understood solely through human nature as its proximate cause.

But, since every man by the laws of his nature desires that which he deems good, and endeavours to remove that which he deems bad (IV.

xix.); and further, since that which we, in accordance with reason, deem good or bad, necessarily is good or bad (II.