Date: 1390

"Minerve for the hed thei soghten, / For sche was wys, and of a man / The wit and reson which he can / Is in the celles of the brayn, / Wherof thei made hire soverain."

— Gower, John (c. 1330-1408)

Date: c. 1420

"Thou woost wel, who shal an hous edifie / Gooth nat ther-to withoute avisament / If he be wys, for with his mental ye / First is it seen, purposid, cast & ment, / How it shal wroght been, elles al is shent."

— Hoccleve [Occleve], Thomas (c.1367-1426)

Date: Trans. 1425

"þe brayn..is þe place & þe habitacioun of þe resonable soule, as G[alen] hym selfe seid."

— Guy de Chauliac (c.1300-1368)

Date: Trans. 1425

"Haue alle þe ylke cifers togedur in þi mynde, a-rowe ychon aftur other."

— Johannes de Sacrobosco or Sacro Bosco; John of Holywood (c. 1195 - c. 1256)

Date: w. c. 1425-1440

"Then wolle the chambir of my thought trewly / Of plesaunce take a light in eche parté / Such ioy wolle him aray so fresshe and hy / That waken must myn heuy hert slepé / Out of his fowle and sluggissh slogardé."

— Charles [d'Orléans], duke of Orléans (1394-1465)

Date: 1445

"Eche of þese [v inward bodili wittis: commune witt, ymaginacioun, ffantasie, estimacioun, mind] han to hem her propre chaumbres in þe brayn..as philosophris seyn."

— Pecock, Reginald (c.1395-1460)

Date: 1464

"The mind, to be sure, is like an intellectual book, which sees in itself, and for all, the intention of the author."

— Nicholas of Cusa (1401-1464)

Date: 1464

"For Simple Being, which is visible to the mind alone, is to the mind as the being of color is to the sense of sight."

— Nicholas of Cusa (1401-1464)

Date: 1464

" [I]f someone were to turn his mind's sight to the possibility, or power, of oneness: he surely would see in every number and in all plurality only oneness's power"

— Nicholas of Cusa (1401-1464)

Date: 1464

"Therefore, my dearly beloved Peter, with keen directedness turn your mind's eye to this secret, and with this analysis enter into my writings and into whatever other writings you read, and occupy yourself especially with my books and sermons."

— Nicholas of Cusa (1401-1464)