We live our whole life in groups, a family is a group, our friends are a group, our school, our education, our profession, our social position, our income, our culture, our religion, our gender, our age, our language, our music. Everything in life is divided into groups. Everywhere we go we look for a group to belong to. Sometimes when you realize that some person belongs to the same group as you, you feel excited, because you have at least one thing in common; the group. Many relationships in life are built on this foundation of a common group.
Sometimes you leave a group, or sometimes time comes for the group to leave you. It is like birth and death. You are born into a group of people, your family and when you die you say goodbye to an extended group, which is the universal group of all the groups you were a part of.