Q. 3. What do the Scriptures principally teach?
A. The Scriptures principally teach what man is to believe concerning God, and what duty God requires of man.
The Bible teaches us two main areas of knowledge: Who God is and what we owe to Him. These two facets of scriptural teaching are intimately connected because in revealing who He is, God establishes Himself firmly as the one who is entitled to direct and guide our lives. From the very first pages of the scriptures God is revealed to be the creator of all things. They go on from there to establish that God did not merely wind up the universe like a watch and leave it to run unattended, but rather He is providentially ruling and guiding all things. He is King over all things because He created them and reigns over them to this day. Even apart from His glorious work in salvation and redemption we would owe Him all of our obedience, praise, and worship.
And yet, the story gets better! For God did not just create us and sustain us, but offers us salvation as well!. One of the key things that the scriptures reveal about God is that He offers us salvation from sins through the blood of His Son, Jesus Christ. The Son, the Second Person of the Trinity took on humanity and did what we never could. He lived a life of sinless obedience to God, obeying even unto death on the cross. His death on the cross is accepted by the Father as an acceptable substitute and atonement for the death sentence that we deserve as sinners. For this salvation to be effective for us we must believe, fundamentally, that God is who He says He is and that He has done what He says He has done.
In revealing who God is, it makes clear that He has the right, authority, and privilege for commanding us to do whatever He wills. More than a human father with his son, the scriptures speak of it in terms of the authority that a potter has over his clay (Rom 9:21). The creator God made us for a purpose and is well within His rights to command us to obey. This duty which God requires of man is binding on all men at all times and so what is a death sentence for the unbeliever, who refuses to obey, is joy and life for the believer, who delights to obey and please God.
Please read John 14:1-31