Reading the bible gives us God’s perspective on life to both explain and remedy our predicament. However, to understand the bible accurately, the text has to be taken as a whole; that is, all sixty six books need to be accepted by the reader. This acceptance does not mean human interpretations need to be believed about controversial passages. What I mean is, the reader bringing preconceived ideas to the text. Instead, the reader should let the text speak for itself.
All sixty six books cohere together since the themes interconnect. Also, the N.T. writers of scripture and Jesus quote earlier texts to show fulfillment of promises. 2 Tim. 3.16 affirms all scripture is God-breathed and is advantageous for teaching, for conviction, for rectification, and for training in righteousness.
Of course, not all of the bible is equally important or relevant in itself. For instance, Christians today do not perform pilgrimages or invest a priest with Aaron’s garments. Instead, Christians are pilgrims and priests, intrinsically, since they are under The New Covenant. Also, Jesus stated that some matters were more important than others in the bible when disputing with the Pharisees: but you have neglected the more important matters of the law—justice, mercy and faithfulness (Mt. 23.23 NIV). God disclosed His word in many portions, and in various ways (Heb. 1.1), but the whole of it is profitable to us today.