Art has a love of chance, and chance for art.
-Agathon, Fragment 4. He means to say that the two are inseparable from one another. 
That man is best who sees the truth himself;
Good too is he who listens to wise counsel.
But who is neither wise himself nor willing
To ponder wisdom is not worth a straw.
-Hesiod, Works & Days c. 700 BC 
Fact Check it, Yo!
Perfer et obdura; dolor hic tibi proderitolim. Be patient and tough, this pain will serve you one day.
~Ovid (43BC- c. 18AD) A famous Latin poet and precursory to the works of Dante, Marlowe, and even Shakespeare. So he was kind of a big deal.