This lately discovered _Commonplace Book_ throws a flood of light upon Berkeley’s state of mind between his twentieth and twenty-fourth year. It is a wonderful revelation; a record under his own hand of his thoughts and feelings when he first came under the inspiration of a new conception of the nature and office of the material world. It was then struggling to find adequate expression, and in it the sanguine youth seemed to find a spiritual panacea for the errors and confusions of philosophy. It was able to make short work, he believed, with atheistic materialism, and could dispense with arguments against sceptics in vindication of the reality of experience. The mind-dependent existence of the material world, and its true function in the universe of concrete reality, were to be disclosed under the light of a new transforming self-evident Principle. “I wonder not at my sagacity in discovering the obvious and amazing truth. I rather wonder at my stupid inadvertency in not finding it out before—’tis no witchcraft to see.” The pages of the _Commonplace Book_ give vent to rapidly forming thoughts about the things of sense and the “ambient space” of a youth entering into reflective life, in company with Descartes and Malebranche, Bacon and Hobbes, above all, Locke and Newton; who was trying to translate into reasonableness his faith in the reality of the material world and God. Under the influence of this new conception, he sees the world like one awakening from a confused dream. The revolution which he wanted to inaugurate he foresaw would be resisted. Men like to think and speak about things as they have been accustomed to do: they are offended when they are asked to exchange this for what appears to them absurdity, or at least when the change seems useless. But in spite of the ridicule and dislike of a world long accustomed to put empty words in place of living thoughts, he resolves to deliver himself of his burden, with the politic conciliation of a skilful advocate however; for he characteristically reminds himself that one who “desires to bring another over to his own opinions must seem to harmonize with him at first, and humour him in his own way of talking.” ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐