Christianity is Other-Person Centered

Genesis 4:9 contains one of the Bible’s most famous questions.   When faced with the consequences of the first murder and asked by the LORD, “Where is Abel your brother?” Cain responded by inquiring “I do not know; am I my brother’s keeper?”

What about us?   There are certainly ways in which we are NOT “keepers” of one another.   There are distinct aspects of your relationship to God and other people in which you will be individually accountable.   Period.   But are there any ways in which we are expected by our heavenly Father to be interconnected?   And if so, what are they?