I remember what a Pastor once said, "We have to learn to be good at being wrong." David in the Psalms was called a man after God's own heart because he was good at being wrong.(Psalm 51) His fight to keep his sin from being exposed was fairly short lived, and then he was open and honest about his wrong doings...which makes me think he knew something about God that many of us don't. We hide and blame and get defensive...then argue and become self-righteous, all to cover up that we are insecure about the possibility that we may not be right.
Our will is quite stubborn. There are people that remind me of a 2 year old child...as I've seen two year olds hold their breath till they literally pass out! I guess I would say that the typical 2 year old is the epitome of the human nature. Do you know of any perpetual '2 year olds'?
We were born with a nature that at it's heart is self-centered. Therefore, because of pride, we have a hard time admitting that we are imperfect and very possibly wrong. This is however one of those things we must conquer in order to grow.
We have to take off the mask of pride, as it is imperative for us to humble ourselves and allow God to change the way we think, so we are OK with being an imperfect person in an imperfect body, among imperfect people in a world that is also imperfect...otherwise it will be very hard to embrace all of God's love (including loving God and neighbor as oneself), His ways and discipline...and therefore find any success in this Christian life.
Another big reason we quickly put on our mask of pride, is shame. Just as Adam and Eve ran from God and hid themselves out of disgrace, this is why we try and put up our defenses as well. However, Jesus also bore our shame and then ignored it, and by His example we can count it as nil too. Take time in Heb. 12- http://nlt.scripturetext.com/hebrews/12.htm
YES! We have His written word so we can feed on truth, the truth of God that sets us free. However, because we have a tendency to look at things very black and white as well as punitively because of the human nature we still battle with...we must read scripture in the light of Christ's life, grace and His Holy Spirit...other wise, we will have a tendency to read it as a rule book and feel condemned and shamed!