What makes one love others? Ephesians 5 tells me it begins when Christ's love is experienced in our lives.
Everyone's different. Every piece unique. Probably already knew that but fitting together takes...a heart with capacity for others.
Motivation? Surely not for one's benefit because others can see and sense that. What then?
What is love? Go figure. Go experience it. Go tell it on the mountain. Go give it. Go.