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Rationalism begins with a bold claim: “Reason is the primary source of knowledge.”
Thinkers like René Descartes, Baruch Spinoza, and Gottfried Leibniz were the torchbearers
of this idea in the 17th century. They believed that the human mind contains innate ideas—
truths that are built into us from birth. Just as a tree grows from seeds, knowledge grows
from these innate structures of thought.
• Innate Ideas: For rationalists, certain truths don’t come from experience but are
already present in the mind. For example, mathematical truths like 2 + 2 = 4 are
universal and eternal; they don’t depend on whether you have seen two apples and
two more apples.
• Deductive Reasoning: Rationalists trusted deduction—the process of starting with
general truths and working down to specific conclusions. Descartes famously said, “I
think, therefore I am,” proving his own existence through reasoning alone.
• Certainty of Knowledge: Rationalists aimed for absolute certainty, like in geometry.
If the mind can grasp a clear and distinct idea, then it must be true.
In short, Rationalism puts great faith in the power of the mind, believing that through
reasoning alone, humans can uncover the deepest truths of reality.
The Empiricist Path: Knowledge Through Experience
Now let’s walk with the second guide, Empiricism, which arose strongly in the same period
but took the opposite route. Its champions were John Locke, George Berkeley, and David
Hume, mostly from Britain—so Empiricism is often called the “British school” of philosophy.
Empiricists argued: “The mind is not a storage of ready-made truths. It is like a blank slate
(tabula rasa). Whatever you write on it comes from experience.”
• Sense Experience as the Foundation: For Locke, all ideas come either from sensation
(what we perceive through our senses) or reflection (how we think about those
perceptions). Without experience, there is no knowledge.
• No Innate Ideas: Empiricists strongly denied that humans are born with built-in
knowledge. A newborn does not know mathematics, morals, or science. All these
come through interacting with the world.
• Induction and Probability: Instead of deduction, empiricists relied on induction—
drawing general conclusions from repeated experiences. For example, when we see
the sun rise every morning, we form the belief that it will rise again tomorrow.
Empiricism, therefore, grounded knowledge in the physical and observable world. It was
practical, testable, and closely aligned with the growth of modern science.
Comparing the Two: Head vs. Hand, Mind vs. Senses