Then we know we are right. The Bible is the Word of God. The words of God are truth. Therefore, the Bible contains all truth. The Bible is the authority in Christianity because man cannot direct his own way.
Many people think that they can decide by themselves what is right in Christianity.
When man tries to direct his own way, he finds much trouble. When he listens to God, he does much better. If man were able to direct his own way, God would not have given us the Bible. In order to find the way of life that is pleasing to God, we must let the Bible be our guide. The Bible is the authority in Christianity because we will be judged by it at the second coming of Christ.