Five hundred years ago, Western knowledge was largely controlled and cloistered in the Catholic Church. The Reformation Luther ushered in was a great liberating force in this area, and in conjunction with advances in printing, revolutionised the spread of information and ideas. The written word rapidly lost its talismanic attributes, but became more valued in other ways.
As John Milton, another staunch Protestant, wrote in the following century, "who destroys a good book kills reason itself." Being informed and challenged directly by text was a major advance that Luther's rebellion contributed to, and a fledgling media was one of the early fruits of this transformation in text.
The Reformation also unleashed a questioning spirit - a sometimes healthy doubt in accepted beliefs and a desire to discover new truths. Since that time, this inquiring spirit has propelled enormous advances in the sciences and in human society more generally.
Until Luther's time, the Church was the absolute authority on matters of doctrine. Western Europe's religious dogma, and its belief in the divinity of its political leaders, was determined by the Church. Papal authority was the alpha and omega of not only religious faith, but royal authority as well. Dissent was heresy and treasonous.
It was the principle of personal liberty championed by the Protestants that later enabled the ascent of democracy in the developed world. In issues of faith - and later in political matters - the individual rather than the state was sovereign. The Reformation subverted the power of absolute rulers, and so it was little wonder that it met with such fierce resistance for centuries afterwards from those who preferred to govern without consent.
Of course, the Reformation was not without its faults. Political prospectors in newly minted Protestant nations seized on the opportunities it created to establish or advance their own political dominion. And on the periphery of this revolution, there were brief spasms of virulent anti-Semitism, more prolonged bouts of often vicious warfare, and the usual abuses that accompany the birth of most revolutions.
But once the dust had settled, the view of the world was irrevocably changed, and it's a view we can still see all around us, and more importantly, within ourselves.
No other revolution in history has changed people's identity as the Reformation did. Luther could never have imagined how widespread and long-lasting his role in it would be, but from the vantage point of half a millennium, we can appreciate his contribution to what we otherwise probably take for granted as the modern world.