2Petr 1,21

For no prophecy was ever produced by the will of man, but men spoke from God as they were carried along by the Holy Spirit.

As it stands, the Bible in it's entirety is God's Word, it is the Truth because it was written by men illuminated, led and controlled by the third person of the Trinity. That's THE first starting point or first principle of any christian worldview. God made man in his image. That means he reflects God's way of feeling, willing and thinking. According to the Bible man is able to think God's thoughts after him. This thoughts can be expressed by language.

There are only some necessary truths: inspiration of the Bible, God's existence, God being the way as revealed in the Bible not lying, unchanging, eternal, omniscient, omnipresent, trinitarian and so on, further, creation (excluding evolution), man being made in the image of God besides some others.

Other things are matters of interpretation we are to be settled on the basis of a historic-grammatical, straight forward reading of the scripture.