But there is no impossibility in a man standing still, yet moving his arms, or in a top which is fixed on one spot going round upon its axis.

There is no necessity to mention all the possible exceptions; let us provisionally assume that opposites cannot do or be or suffer opposites in the same relation.

And to the class of opposites belong assent and dissent, desire and avoidance.
And one form of desire is thirst and hunger: and here arises a new point--thirst is thirst of drink, hunger is hunger of food; not of warm drink or of a particular kind of food, with the single exception of course that the very fact of our desiring anything implies that it is good.

When relative terms have no attributes, their correlatives have no attributes; when they have attributes, their correlatives also have them.

For example, the term 'greater' is simply relative to 'less,' and knowledge refers to a subject of knowledge.