“Well, that is one of the three foundations of learning: see much, study much, suffer much.”
Source: The Chronicles of Prydain (1964–1968), Book I: The Book of Three (1964), Chapter 1
A Welsh triad cited in A Vindication of the Genuineness of the Ancient British Poems of Aneurin, Taliesin, Llywarch Hen, and Merdin (1803), by Sharon Turner, reads, "The three pillars of learning; seeing much, suffering much, and studying much". This was quoted from Turner by Isaac D'Israeli in his The Amenities of Literature (1841) and, through the confusion of father with son, has come to be falsely attributed to Benjamin Disraeli.
Misattributed
“Well, that is one of the three foundations of learning: see much, study much, suffer much.”
Source: The Chronicles of Prydain (1964–1968), Book I: The Book of Three (1964), Chapter 1
“He who would love much has also much to suffer.”
"To My__" (December 1890)
“There is as much to be learned from a man with little, as there is from a man with much.”
Ch. 6 http://www.resologist.net/talent06.htm
Wild Talents (1932)
Seeing
The Note-Books of Samuel Butler (1912), Part IX - A Painter's Views on Painting
“Always make the audience suffer as much as possible.”
“Moscow is a city that has much suffering ahead of it.”
Three Years (1895)
“Each painting contains so much suffering.”
1960's, Conversations with Samuel Beckett and Bram van Velde' (1965 - 1969)