Confucius 
The Analects of Confucius [EPUB ebook] 

Tsze-hsia said, ‘If a man withdraws his mind from the love of beauty, and applies it as sincerely to the love of the virtuous; if, in serving his parents, he can exert his utmost strength;
if, in serving his prince, he can devote his life; if, in his intercourse with his friends, his words are sincere:— although men say that he has not learned, I will certainly say that he has.’