|Leon Trotsky - from Wikipedia|
The idealists and their almost deaf and blind disciples, the Russian subjectivists, thought that mind and critical reason moved the world, or in other words that the intelligentsia directed progress. As a matter of fact, all through history mind limps after reality.Leon Trotsky. Literature and Revolution
Trotsky was only partly right. We rationalise after the fact but theories often come before the facts that eventually support them. Otherwise there would be no progress.