The distinction that Hegel has in mind here is naturally in the first instance distinction from all other things or concepts.  But in his hands this quickly develops into contradiction of them, and finally, reflected back upon itself, into self-contradiction; and the immanent self-contradictoriness of all finite concepts thenceforth becomes the propulsive logical force that moves the world.[2] ’Isolate a thing from all its relations,’ says Dr. Edward Caird,[3] expounding Hegel, ’and try to assert it by itself; you find that it has negated itself as well as its relations.  The thing in itself is nothing.’  Or, to quote Hegel’s own words:  ’When we suppose an existent A, and another, B, B is at first defined as the other.  But A is just as much the other of B. Both are others in the same fashion....  “Other” is the other by itself, therefore the other of every other, consequently the other of itself, the simply unlike itself, the self-negator, the self-alterer,’ etc.[4] Hegel writes elsewhere:  ’The finite, as implicitly other than what it is, is forced to surrender its own immediate or natural being, and to turn suddenly into its opposite....  Dialectic is the universal and irresistible power before which nothing can stay.... Summum jus, summa injuria—­to drive an abstract right to excess is to commit injustice....  Extreme anarchy and extreme despotism lead to one another.  Pride comes before a fall.  Too much wit outwits itself.  Joy brings tears, melancholy a sardonic smile.’[5] To which one well might add that most human institutions, by the purely technical and professional manner in which they come to be administered, end by becoming obstacles to the very purposes which their founders had in view.

Once catch well the knack of this scheme of thought and you are lucky if you ever get away from it.  It is all you can see.  Let any one pronounce anything, and your feeling of a contradiction being implied becomes a habit, almost a motor habit in some persons who symbolize by a stereotyped gesture the position, sublation, and final reinstatement involved.  If you say ‘two’ or ‘many,’ your speech betrayeth you, for the very name collects them into one.  If you express doubt, your expression contradicts its content, for the doubt itself is not doubted but affirmed.  If you say ‘disorder,’ what is that but a certain bad kind of order? if you say ‘indetermination,’ you are determining just that.  If you say ’nothing but the unexpected happens,’ the unexpected becomes what you expect.  If you say ’all things are relative,’ to what is the all of them itself relative?  If you say ‘no more,’ you have said more already, by implying a region in which no more is found; to know a limit as such is consequently already to have got beyond it; And so forth, throughout as many examples as one cares to cite.

Whatever you posit appears thus as one-sided, and negates its other, which, being equally one-sided, negates it; and, since this situation remains unstable, the two contradictory terms have together, according to Hegel, to engender a higher truth of which they both appear as indispensable members, mutually mediating aspects of that higher concept of situation in thought.