From Wikipedia

Although Socrates —who was the main character in most of Plato ‘s dialogues—was a genuine historical figure, it is commonly understood that in later dialogues Plato used the character of Socrates to give voice to his own philosophical views. The Socratic problem refers to the difficulty or inability of determining what in Plato’s writings is an accurate portrayal of Socrates ‘ thought and what is the thought of Plato with Socrates as a literary device.

Employ your time in improving yourself by other men’s writings, so that you shall gain easily what others have labored hard for.  

I was really too honest a man to be a politician and live.  

Let him that would move the world first move himself.    

Ordinary people seem not to realize that those who really apply themselves in the right way to philosophy are directly and of their own accord preparing themselves for dying and death.  

The greatest way to live with honor in this world is to be what we pretend to be.  

The unexamined life is not worth living.  

Wisdom begins in wonder.