4do not merely look out for your own personal interests, but also for the interests of others.
Basically - we are to live as Christ lived.
Hmm, easy to say, hard to do. Just think about when you drive and someone pulls out in front of you. : )
So, how do we mere mortals live like Jesus?
Good news - we don't do it on our own. Can't. If we were capable of being perfect, we wouldn't have needed Jesus and His sacrifice.
We have the Holy Spirit. Listen to Him. Spend time with Him. The Word says to guard our hearts and minds. We can do that with spending time with the Lord and learning His Word.
With Jesus, all things are possible. Even for us to smile at the person who just pulled out in front of us as we are driving.