The Middle Ages were an era of mysticism, ruled by blind faith and blind obedience to the dogma that faith is superior to reason. The Renaissance was specifically the rebirth of reason, the liberation of man's mind, the triumph of rationality over mysticism - a faltering, incomplete, but impassioned triumph that led to the birth of science, of individualism, of freedom.
Ayn Rand (1971). “The New Left: the Anti-Industrial Revolution”