Zealous to the End

Romans 12:11 admonishes that we should not be slothful in zeal, but be fervent in spirit, serve the Lord. What does it mean to zealously serve the Lord? Philippians 2 provides some insight wherein there is a mindset we ought to have, and example we ought to follow, a word we ought to do, and an end to keep in view. Ultimately, we are called to evaluate those things that are "actually" important.