An excerpt from the beginning of the book:
God said in Genesis 2:18, “It is not good for the man to be alone.” Those words are often used in the context of marriage relationships, but the application is broader in scope. God cares about all relationships. People are not meant to be alone. You need other people, and other people need you. You were not created for isolation. Moses had Aaron. Paul had Barnabas. Timothy had Paul. Paul and Luke were traveling companions and fellow workers (Phil. 1:24; Col. 4:14; 2 Tim. 4:11). Ruth had Naomi, or Naomi had Ruth. It is reciprocal. Priscilla and Aquila. David and Jonathan. Jesus sent them out in pairs. Who is walking with you?
You were also created for a purpose. “And God blessed them, and God said to them, ‘Be fruitful and multiply’” (Genesis 1:28a, Revised Standard Version). That early command of God is about more than simply having children. It is also about reproducing a spiritual family by investing in other people and making disciples. Who are you walking with?