Sir Philip Sidney (1554-1583) was an Elizabethan courtier, soldier, and poet. The quotation derives from The Countess of Pembroke’s Arcadia (1590), and sets out Sidney’s definition of a gentleman. Late in his writing career, MacDonald published a collection of excerpts from Sidney: A Cabinet of Gems, Cut and Polished by Sir Philip Sidney (1892). MacDonald lectured on Sidney as early as 1854.
Sidney, Philip, "Phantastes Chapter 23: The Countess of Pembroke’s Arcadia" (1590). German Romantic and Other Influences. 28.