Most medieval philosophers after St. Augustine (354–430) took an empiricist position, at least about concepts, even if they recognized much substantial but nonempirical knowledge. The standard formulation of this age was: “There is nothing in the intellect that was not previously in the senses.” Thus St. Thomas Aquinas (quoted above) (1225–74) rejected innate ideas altogether (as seen in earlier posts).
Both soul and body participate in perception, and all ideas are abstracted by the intellect from what is given to the senses. Human ideas of unseen things, such as angels and demons and even God, are derived by analogy from the seen.|The 13th-century scientist Roger Bacon emphasized empirical knowledge of the natural world and anticipated the polymath Renaissance philosopher of science Francis Bacon (1561–1626) in preferring observation to deductive reasoning as a source of knowledge.
The empiricism of the 14th-century Franciscan nominalist William of Ockham was more systematic. All knowledge of what exists in nature, he held, comes from the senses, though there is, to be sure, “abstractive knowledge” of necessary truths; but this is merely hypothetical and does not imply the existence of anything. His more extreme followers extended his line of reasoning toward a radical empiricism, in which causation is not a rationally intelligible connection between events but merely an observed regularity in their occurrence. (1)
In response to the early-to-mid-17th century "continental rationalism" John Locke (1632–1704) proposed in An Essay Concerning Human Understanding (1689) a very influential view wherein the only knowledge humans can have is a posteriori, i.e., based upon experience. Locke is famously attributed with holding the proposition that the human mind is a tabula rasa, a "blank tablet", in Locke's words "white paper", on which the experiences derived from sense impressions as a person's life proceeds are written. Locke wrote: there are two sources of our ideas: sensation and reflection
In both cases, a distinction is made between simple and complex ideas. The former are unanalysable, and are broken down into primary and secondary qualities. Primary qualities are essential for the object in question to be what it is. Without specific primary qualities, an object would not be what it is. For example, an apple is an apple because of the arrangement of its atomic structure. If an apple were structured differently, it would cease to be an apple. Secondary qualities are the sensory information we can perceive from its primary qualities. For example, an apple can be perceived in various colours, sizes, and textures but it is still identified as an apple.
Therefore, its primary qualities dictate what the object essentially is, while its secondary qualities define its attributes. Complex ideas combine simple ones, and divide into substances, modes, and relations. According to Locke, our knowledge of things is a perception of ideas that are in accordance or discordance with each other, which is very different from the quest for certainty of Descartes. (2)
The term became useful in order to describe differences perceived between two of its founders Francis Bacon, described as an "empiricist", and René Descartes, who is described as a "rationalist". Bacon's philosophy of nature was heavily derived from the works of the Italian philosopher Bernardino Telesio and the Swiss physician Paracelsus. Thomas Hobbes and Baruch Spinoza, in the next generation, are often also described as an empiricist and a rationalist respectively. John Locke (empricist), George Berkeley (idealist), and David Hume (skeptic) were the primary exponents of empiricism in the 18th century Enlightenment, with Locke being normally known as the founder of empiricism as such. (2)
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