Gawain and the Green Knight
by Edward Im and Samip K.
Respectful to women
In lines 190-196,
"She held toward him a ring of the yellowest gold
And, standing aloft on the band, a stone like a star
From which flew the splendid beams like the light of the sun;
And mark you well, it was worth a rich king's ransom.
But right away he refused it, replying in haste,
'My lady gay, I can hardly take gifts at the moment;
Having nothing to give, I'd be wrong to take gifts in turn.'"
Gawain respectfully declined the lady's wish to give him presents. He felt that he did not have anything worth to give back to her that has the same value of the present she gave him so he was being non-selfish.
Strength
Lines 148-152
"And then, swiftly, he slashed at the naked neck;
The sharp of the battleblade shattered asunder the bones
And sank through the shining fat and slit into two,
And the bit of the bright steel buried itself in the ground.
The fair head fell from the neck to the floor of the hall"
Gawain proved his strength when he beheaded the Green Knight. The description of the Green Knight says he is a very large man so cutting through all that fat and bones must have required quite a considerable amount of strength.