The information about Sir Gawain's temperament that is revealed in the following lines from Sir Gawain and the Green Knight is that Gawain is ready to fight the green knight as he has withstood three blows.
The story shows how a classic quest formula in which a knight received a challenge from Gawain to go on a journey to meet that challenge. Therefore, when night asked for three bows, Gawain was ready to fight as he was NOT a coward.
However, in the end, Gawain found out that honor must be filled with honesty.
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