We ought to give up our search for one "golden rule." There is only one thing which should be the center of our life: and it is not a truth. It is a Person: God, the Triune, the Creator, the Sovereign, the Redeemer. Centering one's life on God is not simple: this actually makes your life much more complex, busy, and full of duties to remember. A short list: pray always, commune with God, exalt Him in your life, humble yourself before Him, love others as yourself, love God with all your self, read God's word, be filled with God's Spirit, love and serve God's church, spread God's good news, and so on and so on. My point is this: Stop looking to one truth or duty to give you life. Allow God's demands on you to be many, and follow Him as hard as you can with your whole life.