1 Peter 1.13 commends, with your minds ready for action, be sober-minded and set your hope completely on the grace to be brought to you at the revelation of Jesus Christ.
Not complicated really how we are to live. We, who hope in the return of Jesus the Savior because we believe in His resurrection from the dead after He perfectly and thoroughly conquered the penalty of sin which is death. We are to live different lives because we are different people, aliens and strangers in this world seeking a better home, a home that lasts forever with God and all those who have ever loved Him by obeying His commands from all time in all places.
How are we different from the world? Our mind is set for action, not the action of making money or accumulating the temporary trinkets of this world but for doing the will of God. The will of God is for all people to be reconciled to Him before His return for them so the action we are constantly looking to take is the sharing of the gospel with people who are around us and appear interested in things above.
While we live in this world we live sober-minded, meaning we are not drunk on the pursuit of pleasure and power but we seek to live holy lives because God is holy. We appear sober to a revelry filled world that has no hope and no fear of facing God when He appears again to punish all those who have disobeyed His command to repent and be born again.
No matter the cost of taking action towards winning people to Christ, no matter the ridicule and scorn for being sober-minded, we who are in Christ stay focused upon Christ looking forward to His return and His promise of righteousness and peace restored to the world forever.