“For he who is unmusical is a child in music; he who is without letters is a child in learning; he who is untaught, is a child in life.”
Book III, ch. 19. http://books.google.com/books?id=7e0NAAAAYAAJ&q=%22For+he+who+is+unmusical+is+a+child+in+music+he+who+is+without+letters+is+a+child+in+learning+he+who+is+untaught+is+a+child+in+life%22&pg=PA241#v=onepage
Discourses
Help us to complete the source, original and additional information
Epictetus 175
philosopher from Ancient Greece 50–138Related quotes

“Yes, that's how it is, child. He who works, he who is patient is the superior.”
Source: In the Ravine (1900), Ch. 5, pp. 208

“It's like a child who is used to having ice cream whenever he wants.”
Crystal Palace 1-1 Arsenal (6 November 2004) http://www.guardian.co.uk/football/2004/nov/08/match.sport10?INTCMP=SRCH
Interviews
Context: It's like a child who is used to having ice cream whenever he wants. When it doesn't come when he asks he tends to get confused and nervous.

“He who shall teach the child to doubt
The rotting grave shall ne'er get out.”
Source: 1800s, Auguries of Innocence (1803), Line 87

Walter Scott, manuscript note written in 1825; cited from J. G. Lockhart The Life of Sir Walter Scott, Bart. (London: Adam and Charles Black, 1896) p. 81 col. 2.
Criticism