Wisdom from the Early Stoics, Zeno of Citium 9

A Rhodian, who was handsome and rich, but nothing more, insisted on joining his class; but so unwelcome was this pupil, that first of all Zeno made him sit on the benches that were dusty, that he might soil his cloak, and then he consigned him to the place where the beggars sat, that he might rub shoulders with their rags. So at last the young man went away. 

Nothing, he declared, was more unbecoming than arrogance, especially in the young. 

He used also to say that it was not the words and expressions that we ought to remember, but we should exercise our mind in disposing to advantage of what we hear, instead of, as it were, tasting a well-cooked dish or well-dressed meal. 

The young, he thought, should behave with perfect propriety in walk, gait, and dress, and he used continually to quote the lines of Euripides about Capaneus: 

Large means had he, yet not the haughtiness
That springs from wealth, nor cherished prouder thoughts
Of vain ambition than the poorest man.    
 
—Diogenes Laërtius, 7.22