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Locke also discerns a third kind of quality: tertiary qualities, which is defined as object or substance’s power to affect another object, like fire melting wax.[[CiteRef::Locke (2015b)]] He maintains that objects produce ideas in the minds of people through physical impact upon them, through small particles—corpuscles—that travel from the object to the mind of the person.[[CiteRef::Locke (2015b)|p. 29]]

The Aristotelian conception of scientific knowledge prevailed prior to Locke’s work stated that scientific knowledge concerned certain knowledge of necessary truths. Locke, upon realization that this demand of scientific knowledge was too strict for the experimental science of his time, developed a new conception that was more appropriate, while retaining the Aristotelian scientific knowledge as an ideal.[[CiteRef::Kochiras (2014)|p. 4]] According to Locke, there are two kinds of scientific knowledge, and they differ in their degree of certainty. Intuition is knowledge understood instantly, and demonstration is knowledge understood after a set of intermediate steps. Both intuition and demonstration are forms of certain knowledge.[[CiteRef::Kochiras (2014)|p. 8]]