What rule hath God given to direct us how we may glorify and enjoy him? – Shorter Westminster Catechism

The Word of God, which is contained in the Scriptures of the Old and New Testaments, is the only rule to direct us how we may glorify and enjoy him.

Shorter Westminster Catechism

What is the chief end of man? – Shorter Westminster Catechism

What do the Scriptures principally teach? – Shorter Westminster Catechism