Question: What century did the author of A Treatise Concerning the Principles of Human Knowledge live in?

Knowledge 1: A Treatise Concerning the Principles of Human Knowledge
A Treatise Concerning the Principles of Human Knowledge (commonly called Treatise when referring to Berkeley's works) is a 1710 work, in English, by Irish Empiricist philosopher George Berkeley. This book largely seeks to refute the claims made by Berkeley's contemporary John Locke about the nature of human perception. Whilst, like all the Empiricist philosophers, both Locke and Berkeley agreed that we are having experiences, regardless of whether material objects exist, Berkeley sought to prove that the outside world (the world which causes the ideas one has within one's mind) is also composed "solely" of ideas. Berkeley did this by suggesting that "Ideas can only resemble Ideas" – the mental ideas that we possess can only resemble other ideas (not material objects) and thus the external world consists not of physical form, but rather of ideas. This world is (or, at least, was) given logic and regularity by some other force, which Berkeley concludes is God. [SEP] Knowledge 2: Idealism
The earliest extant arguments that the world of experience is grounded in the mental derive from India and Greece. The Hindu idealists in India and the Greek Neoplatonists gave panentheistic arguments for an all-pervading consciousness as the ground or true nature of reality. In contrast, the Yogācāra school, which arose within Mahayana Buddhism in India in the 4th century CE, based its "mind-only" idealism to a greater extent on phenomenological analyses of personal experience. This turn toward the subjective anticipated empiricists such as George Berkeley, who revived idealism in 18th-century Europe by employing skeptical arguments against materialism.
Knowledge 1: A Treatise Concerning the Principles of Human Knowledge
A Treatise Concerning the Principles of Human Knowledge (commonly called Treatise when referring to Berkeley's works) is a 1710 work, in English, by Irish Empiricist philosopher George Berkeley. This book largely seeks to refute the claims made by Berkeley's contemporary John Locke about the nature of human perception. Whilst, like all the Empiricist philosophers, both Locke and Berkeley agreed that we are having experiences, regardless of whether material objects exist, Berkeley sought to prove that the outside world (the world which causes the ideas one has within one's mind) is also composed "solely" of ideas. Berkeley did this by suggesting that "Ideas can only resemble Ideas" – the mental ideas that we possess can only resemble other ideas (not material objects) and thus the external world consists not of physical form, but rather of ideas. This world is (or, at least, was) given logic and regularity by some other force, which Berkeley concludes is God. [SEP] Knowledge 2: Humanism
Eliot and her circle, who included her companion George Henry Lewes (the biographer of Goethe) and the abolitionist and social theorist Harriet Martineau, were much influenced by the positivism of Auguste Comte, whom Martineau had translated. Comte had proposed an atheistic culte founded on human principles – a secular Religion of Humanity (which worshiped the dead, since most humans who have ever lived are dead), complete with holidays and liturgy, modeled on the rituals of what was seen as a discredited and dilapidated Catholicism. Although Comte's English followers, like Eliot and Martineau, for the most part rejected the full gloomy panoply of his system, they liked the idea of a religion of humanity. Comte's austere vision of the universe, his injunction to "vivre pour altrui" ("live for others", from which comes the word "altruism"), and his idealisation of women inform the works of Victorian novelists and poets from George Eliot and Matthew Arnold to Thomas Hardy.
Knowledge 1: A Treatise Concerning the Principles of Human Knowledge
A Treatise Concerning the Principles of Human Knowledge (commonly called Treatise when referring to Berkeley's works) is a 1710 work, in English, by Irish Empiricist philosopher George Berkeley. This book largely seeks to refute the claims made by Berkeley's contemporary John Locke about the nature of human perception. Whilst, like all the Empiricist philosophers, both Locke and Berkeley agreed that we are having experiences, regardless of whether material objects exist, Berkeley sought to prove that the outside world (the world which causes the ideas one has within one's mind) is also composed "solely" of ideas. Berkeley did this by suggesting that "Ideas can only resemble Ideas" – the mental ideas that we possess can only resemble other ideas (not material objects) and thus the external world consists not of physical form, but rather of ideas. This world is (or, at least, was) given logic and regularity by some other force, which Berkeley concludes is God. [SEP] Knowledge 2: Tabula rasa
The modern idea of the theory, however, is attributed mostly to John Locke's expression of the idea in Essay Concerning Human Understanding (he uses the term ``white paper ''in Book II, Chap. I, 2). In Locke's philosophy, tabula rasa was the theory that at birth the (human) mind is a`` blank slate'' without rules for processing data, and that data is added and rules for processing are formed solely by one's sensory experiences. The notion is central to Lockean empiricism; it serves as the starting point for Locke's subsequent explication (in Book II) of simple ideas and complex ideas. As understood by Locke, tabula rasa meant that the mind of the individual was born blank, and it also emphasized the freedom of individuals to author their own soul. Individuals are free to define the content of their character -- but basic identity as a member of the human species can not be altered. This presumption of a free, self - authored mind combined with an immutable human nature leads to the Lockean doctrine of ``natural ''rights. Locke's idea of tabula rasa is frequently compared with Thomas Hobbes's viewpoint of human nature, in which humans are endowed with inherent mental content -- particularly with selfishness.

Answer: 18th