Hughes
"Teach for some purpose—application, worship; not for pleasure's sake, recreation." [Harmonies of Tones and Colours, Fragments from the Last Note-book, page 50]
Cayce
"Have a goal of contributing not only to your pleasure but to someone else's, or to several others, every day. Think of others, because by helping others you will help yourself." [Cayce (2959-1]
See Also