When it comes to moments that have changed the course of history, we usually think of inventions like writing, the wheel, and the lightbulb. But what about the numerous ideas that have caused massive upheavals in the way we think and how the world spins? There are many fruits to pick from ranging from the methodology of logic, materialism and heliocentrism to monotheism, the unconscious and natural selection.

Here are ten influential ideas that forever changed the Western World and how we operate in it.

1: Greek Logic

The Greeks did a whole lot more than run around half naked and throw stone frisbees into the air. They were masters of intellectual craftsmanship, and their thoughts and ideas have formed the foundation of Western intellectual institutions down to today. Aristotle’s powerful methodology in logic give us the power to determine the validity of a statement by its structure alone, regardless of content, allowing us to create order and meaning out of the words we say and write.

2: Monotheism

Whether or not you consider yourself a believer, it’s difficult to ignore the world-changing effects of belief in one deity. Prior to monotheism, ancient peoples would pray to whatever god or goddess related to their particular need. If another country triumphed over them, then of course that god must have been stronger. But the advent of monotheistic beliefs and their attendant scriptures gave credence to the idea of personal accountability and the injunction to build society on immutable principles across national lines.

3: Democracy

Some tend to think of democracy as originating in the land of stars and stripes, but the truth is that it began long before that. Whether you go back to primitive/proto democracy practiced in tribal communities long before the advent of history or if you turn your gaze to ancient Greece, where the city-state Athens was the first government to implement a limited form of direct democracy 2500 years ago.

However democracy as we know it today, as in democratic parliaments, can in many ways be traced back to Medieval Feudal England with the signing of the Magna Carta. Over the centuries, the kings and queens had to give up certain powers and privileges in return for the support of the nobles, creating a condition where the absolute power of monarchy was weakened, and laying the framework for the idea of a modern representational government that could echo the design of ancient republics like Rome.

4: The Copernican Model

Ask any child today, and they’ll tell you the earth revolves around the sun. But did you know that wasn’t always the perception people had of the universe? While Galileo and even Copernicus can’t be directly credited with the idea of a sun-centered solar system (the idea has come up several times in the last few millennia), their earth-shattering proposals for the architecture of the cosmos opened the door for scientific, evidence-based inquiry in other areas.

5: Newtonian Physics

Who would have known that the almost biblical action of an apple falling from a tree would spawn a whole genesis of scientific ideas that have played a crucial role in our understanding of the universe? Gravity, calculus, and the laws of motion are just a few of the integral ideas explored by the 16th century wigged genius, Sir isaac Newton, who incidentally was also an alchemist (you know, those dudes who attempt to turn everything into gold).

6: Colonialism

The idea is relatively simple: explore new lands, settle the area, and add to the economic power of the mother country through drawing natural materials from the various lands of the realm—things like silver, spice, and sugar. But add a few competitors to the mix and you end up with a complex horse race of jockeying participants, whose wars and alliances over the issue of global expansion have fueled the last several hundred years of history.

7: Natural Selection

Many people erroneously assume that Darwin invented the idea of evolution. But it’s more accurate to say that he created a simple algorithm: if entities are subject to limited resources, they will engage in a struggle for survival, and if certain characteristics of adaptability are passed on to the next generation, the species under question will become more adept at surviving in that particular environment. This idea has influenced everything from social theories to economics to modern medicine and become popularly known as “survival of the fittest.”

8: Emancipation

For thousands of years, some people were slaves, and others were slave owners, and that’s just the way the cookie crumbled. But starting around the time of the French Enlightenment, moralists and thinkers like Voltaire (expressed in the satire of Candide) began to question the morality of this idea. Over time, countries like Great Britain put an end to the practice of slavery, although others like the United States had to duke it out with some internal dissension. The slow process of emancipation has also spawned more recent movements like women’s liberation and racial equality.

9: Psychology

The notion that there is a whole lot of stuff going on under the surface of a person’s outer being, the unconscious, is not necessarily a new one; ancient peoples acknowledged the idea of an inner world. But with the advent of rationalism and the enlightenment, the idea of emotion-based subconscious processes became buried until it was unearthed by the psychotherapeutic work of Freud, Jung, and others who built on their findings.

10: The Internet

True, we did say we would steer clear of actual inventions. But the internet is more than an invented network of connectivity. It’s the very idea of conducting life in a digital sphere, including research, leisure, commerce, and more all on a globally linked network. It’s become so ingrained in our lives that it’s almost impossible to picture life without it. Moreover, the corollary idea of social media has changed the way we interact and view others, creating new paradigms and rules of engagement between people.


Ideas can and do shape the dynamics of entire civilizations, for human societies ideas are in many ways the underlying mental framework that decides how the majority of us move, think and act. These ones mentioned above are some of the numerous ideas which have influenced the course of western civilization.

If we’ve missed any influential idea feel free to let us know in the comments below.

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