Answer:
Sir Gawain, on one hand, was the figure of spiritual chastity in the midst of temptation. Whereas, Sir Lancelot longed for fleshly desires.
Step-by-step explanation:
Sir Gawain and Sir Lancelot were among the Knights of King Arthur's Round Table.
In retelling of "Sir Gawain and the Green Knight" by J.R.R. Tolkien’s, the Lord's Wife started having liking towards Sir Gawain and tries to tempt him. She is even ready to give her body for knightly pleasure to Sir Gawain but Sir Gawain refuses.
"By Saint John, Nay! lover have I none, and none will have meanwhile.”
On the other hand, in "The Knight of the Cart" by Chretien De Troyes’, Sir Lancelot is shown having an adulterous relationship with Gwenivere, King Arthur's Queen.
Thus, we can see the juxtaposition in the Knights of Arthur's Round Table. Sir Gawain is loyal towards his lords even in the midst of the temptation but Sir Lancelot fall victim of his lustful desires and is disloyal to his Lord.
Sir Gawain, is the knight that represents the greater model of chivalry.