What are quotes from the Odyssey about heroism?

In one quote, in book 2, Athena comes to Telemachus disguised as Mentor as he is preparing to sail in search of his father. She encourages him by saying:

Telemachus, you are to be no thoughtless man, no coward, if truly the strong force of your father is instilled in you; such a man he was for accomplishing word and action.

Athena defines courage as being thoughtful rather than rash. She also depicts Odysseus as a man of courage, defining it as "a strong force" but also noting that courage involves the power of speech ("words") as well as action.
In book 9, Odysseus shows what Athena means when she says he courageously uses both words and actions. Here, he helps his companions to be courageous in facing the fearsome Polyphemus through his words:

Then I shoved the beam underneath a deep bed of cinders, waiting for it to heat, and I spoke to all my companions in words of courage, so none should be in a panic, and back out.

Odysseus, by encouraging his men, shows that courage is collective as well as individual. He knows they all need to back each other up and be brave together.
Odysseus also shows his courage in the Cyclops episode when he tells Polyphemus that it was he who blinded him:

Cyclops, if any mortal man ever asks you who it was that inflicted upon your eye this shameful blinding, tell him that you were blinded by Odysseus, sacker of cities.

The quote shows that courage to Odysseus (who Athena has already identified as a model of courage) involves owning up to and taking responsibility for your actions. If Odysseus were more cowardly, he might sneak off and leave Polyphemus wondering who had blinded him, as that would be the safer route. But Odysseus is not afraid to risk Polyphemus's revenge or the revenge of the gods who side with him.
All three quotes show that heroism involves both words and action. Courage is more than simply being a bold warrior, willing to violently face down a powerful opponent, though it is that too (Odysseus does remind us that he is "sacker of cities").