“Learning is all that mass of facts, and of judgments on the facts, and of conclusions drawn therefrom; wisdom is the extracted essence of the whole, that which the Soul has gathered out of all these experiences, and it is, as you are aware, its work in Devachan to turn these experiences into wisdom.”

He here refers to his proposal in "A unitary hypothesis of mind-brain interaction in the cerebral cortex" (1990); published in Proceedings of the Royal Society B 240, p. 433 - 451
How the Self Controls Its Brain (1994)
Context: The hypothesis has been proposed that all mental events and experiences, in fact the whole of the outer and inner sensory experiences, are a composite of elemental or unitary mental experiences at all levels of intensity. Each of these mental units is reciprocally linked in some unitary manner to a dendron … Appropriately we name these proposed mental units 'psychons.' Psychons are not perceptual paths to experiences. They are the experiences in all their diversity and uniqueness. There could be millions of psychons each linked uniquely to the millions of dendrons. It is hypothesized that it is the very nature of psychons to link together in providing a unified experience.

“One and Many,” p. 5
Do What You Will (1928)

Source: Quoted on the Paasikivi monument in Helsinki, supposedly originating from Thomas Carlyle

Hunger of Memory: The Education of Richard Rodriguez (1982)

Source: Life, the Truth, and Being Free (2010), p. 101

Introductory. Pearson refers the reader to William Wordsworth's preface to the Lyrical Ballads (1815) "General View of Poetry".
The Grammar of Science (1900)