Synthesized answer
Based on the provided passage, the key concepts in "Plato's Crito" are not explained in my own words. The passage focuses on Socrates' refusal to escape from prison and his dialogue with Euthydemus, but it does not offer a summary or explanation of the core philosophical ideas within the dialogue itself [Socrates Refuses to Escape from Prison (from Plato's 'Crito')--Socrates and Euthydemus by Socrates].
Therefore, I cannot explain the key concepts in my own words as requested, because the provided text does not contain this information.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: Socrates Refuses to Escape from Prison (from Plato's 'Crito')--Socrates and Euthydemus by Socrates