George Berkeley: what do we mean when we say “exists”?

Rest a hand on the table and look at its edge. What do you add when you say that this table exists? In A Treatise Concerning the Principles of Human Knowledge, published in 1710, George Berkeley begins with just such an everyday object. In section 3 he writes: “The table I write on I say exists, that is, I see and feel it”. These are his original English words, not a modern inspirational paraphrase. [1]

This is more than a request to pay attention. Berkeley defends a more demanding claim: sensible objects, the things we see or touch, cannot be separated from being perceived by a mind. In his vocabulary, ideas include colours, sounds, textures and other experiences, rather than just abstract thoughts. The perceiving mind, by contrast, is active and distinct from those ideas. This distinction matters if we want to understand the argument instead of turning it into a motivational slogan. [1]

The philosopher is not advising us to deny the table while leaning on it. In section 35 he explicitly says that he does not question the existence of things we see and touch: he challenges material substance conceived as entirely independent of perception. He also distinguishes sensory experiences from images we can invent at will. In his account, the world does not automatically become whatever each person wants; imagining a chair is not equivalent to sitting on one. [1]

An obvious difficulty remains: what happens to the table when we leave the room? Berkeley considers our ability to perceive it on returning and its perception by another mind; God has a central role in his system. The Stanford Encyclopedia of Philosophy reconstructs different responses and the problems they raise. Simply closing our eyes therefore neither proves nor refutes the whole theory. The continuing existence of objects is itself a question within the debate. [1][2]

We must keep this metaphysical proposal separate from an experimental explanation of the brain or of physics. We are reconstructing a philosophical position and some objections, not announcing scientific proof that the world disappears. As an editorial exercise, we can instead list what we know about an object through sight and touch, then ask which further claims we are making. The exercise makes a question clearer; it does not decide its answer by itself. [2]

The phrase of the day thus retains a useful strangeness. A table, normally left to support papers and cups, makes us clarify an apparently simple word. We need not become followers of Berkeley to follow this step: distinguish what we experience, what we imagine, and what we claim exists independently of us. The table can stay where it is; our definition of “existing” will have to do a little more work. [1]