Rules for life
1. Love the Lord your God with all your heart, mind, and strength.
2. Love your neighbor as yourself.
Even for an atheist these are logically necessary. Think of God simply as that which is infinitely Good, Beautiful, and True. The important thing is that you set your ideal infinitely far away and that you set that ideal as your highest goal. I.E. that which you love most.
That way when faced with difficult choices, you always choose actions that lead in the same direction. If you set your highest goal at any point shy of infinity you will be subject to cosign errors and can even end up working backwards to achieve it. You end up circling the drain.
Continually ponder perfection and chase after it.