The beginning is the most important part of any work.
The Republic, Book II, tr. Benjamin Jowett
Wonder is the feeling of a philosopher, and philosophy begins in wonder.
Theaetetus 155d, tr. Benjamin Jowett
No one should be discouraged, Theaetetus, who can make constant progress, even though it be slow.
The chief penalty is to be governed by someone worse if a man will not himself hold office and rule.
The Republic, Book I, 347c
There is a victory and defeat, the first and best of victories, the lowest and worst of defeats, which each man gains or sustains at the hands, not of another, but of himself.
Laws, Book I, tr. Benjamin Jowett