Gunnar leaves the Althing very proud of himself and he justifies his pride with his honorability. Gunnar perceives for as long as he had his honor, he would have his pride. As a result, Gunnar is very proud and furthermore, many are proud of Gunnar. As mentioned, upon leaving the Althing Gunnar is very honorable and extremely proud. Gunnar's honor is well justified but his extreme pride is not acceptable in the eyes of other Viking men and this causes him many problems.
Honor is a good thing, but too much pride can be bad.
Although Viking men placed pride as an important attribute, Gunnar has gone above and beyond this by placing his pride as the driving force in everything he does. Gunnar feels justified in doing this because of his honor. Unfortunately, though the other Viking men do not see the same relationship between honor and pride as Gunnar does. As a result, they do not justify his intense pride and ill feelings begin to emerge towards Gunnar. Furthermore, Gunnar's pride forces him to defend his honor because if he loses his honor he will lose his pride.