It is important for us to become fully aware of these pairs of opposites.

Our logical mind does not like them: it generally operates on the either-or or yes-no principle, like a computer. So, at any one time it wishes to give its allegiance to either the one of the other of the pair, and as this exclusiveness inevitably leads to an ever more obvious loss of realism and truth, the mind suddenly changes sides, often without even noticing it.

It swings from one opposite to the other, and every time there is a feeling of ‘making up one's mind afresh'; or else the mind becomes rigid and lifeless, fixing itself on one side of the pair of opposites and feeling that now 'the problem has been solved'.

The pairs of opposites, of which freedom and order and growth and decay are the most basic, put tension into the world, a tension that sharpens man's sensitivity and increases his self-awareness. No real understanding is possible without awareness of these pairs of opposites, which, as it were, permeate everything man does.

Only a higher force - wisdom - can reconcile these opposites. 

The problem cannot be solved; but wisdom can transcend it […] societies need stability and change, tradition and innovation; public interest and private interest; planning and laissez-faire; order and freedom; growth and decay: everywhere society's health depends on the simultaneous pursuit of mutually opposed activities or aims.

The adoption of a final solution means a kind of death sentence for man's humanity and spells either cruelty or dissolution, or generally both.

Divergent problems offend the logical mind which wishes to remove tension by coming down on one side or the other; but they provoke, stimulate and sharpen the higher human faculties without which man is nothing but a clever animal. A refusal to accept the divergency of divergent problems causes these higher faculties to remain dormant and to wither away, and when this happens the 'clever animal' is more likely than not to destroy itself.

Man’s life can thus be seen and understood as a succession of divergent problems which are inevitably encountered and have to be coped with in some way. They are refractory to mere logic and discursive reason, and constitute, as it were, a strain-and-stretch apparatus to develop the Whole Man, and that means to develop man's supra-logical faculties.

All traditional cultures have seen life as a school and have recognised, in one way or another, the essentiality of this teaching force.

[E. F. Schumacher]
A Guide for the Perplexed, p.146-8

Without the enemy life would be meaningless and shallow.

To have no enemies, to have no power to decide who to include as a member of the body and who to exclude as a member of the body, is to not be political at all. And since man is political, and this is part of his human nature, those who attempt to eliminate conflict and transform enemies into “rational actors” whom one can persuade to not have qualms with, are nihilists out to destroy man’s political nature.

(Schmitt makes it clear that liberalism is one such force that attempts to eliminate all conflict and, in doing so, would destroy human nature and make man’s life miserable for he would not be political at all, which is to say he would cease being human if he ceased being political.)

[Paul Krause]
'Carl Schmitt: The Friend-Enemy Distinction'