In Sir Gawain and the Green Knight, how does Gawain express or show generosity and where is it in the poem?

In Sir Gawain and the Green Knight,
the meaning of " href="http://dictionary.reference.com/browse/generous">generous" is
important to note.

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1. liberal in giving or sharing; unselfish;
2. free from meanness or smallness of mind or character;
magnaninous

The first example
of generosity I see on Gawain's part is his willingness to take up arms for King Arthur;
he begs permission to stand rather than having Arthur defend the court against the Green
Knight's challenge.

In the first book (section 15), during
the Christmas feast, when no one else stands except the King, Gawain offers himself,
which I see as a generous gesture.

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Gawain, sitting by the
queen,
could tell the king his
mind:
"Lord, hear well what I
mean,
and let this match be
mine."

Gawain
requests permission to take the match with the Green Knight from Arthur, and fulfill the
challenge himself.

In Book Two (section 24), Gawain speaks
to the knights who are so worried for them. Instead of feeling sorry for himself or
making a fuss for his own fate, he generously comforts those around him, telling them
not to worry on his account:

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But Gawain said with
cheerful face:
"Why shrink back from the
quest?
Though fate bring glory or
disgrace 
A man must meet the
test."

In the
second part of Book Two (section 35), Gawain is generous with his praise to those who
have so kindly welcomed him to Bertilak's castle, and helped him out of his
armor:

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He nobly acknowledged each of those
knights, 
proud men close-pressed to honor a prince.

At the end of the
same passage, Gawain meets his host and is generous of spirit, calling down blessings on
the man, and joining him in a friendly embrace:

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"God bless you," said
Gawain then, 
"And Christ repay your
grace." 
They met like joyful
men
in open-armed embrace.

As a "true and
gentle knight," Gawain is generous in his manner with King Arthur, and down to the
lowliest of servants at Bertilak's castle. While everyone looks to see if he will be a
honorable a man as the Arthurian knights are rumored to be, Gawain is true to his oath
to chivalry and Arthur's court.