Anais Nin put it beautifully when she said, "Each friend represents a world in us, a world possibly not born until they arrive, and it is only by this meeting that a new world is born." Though some natural loners are happy without them, most of us depend greatly on the company of true friends.
Expanding your social network beyond your familiar circle of friends can have surprising benefits. It's those weak ties that bring fresh ideas and unexpected opportunities: a job, an apartment, a mate.
Human beings are social animals, and the tenor of our social life is one of the most important influences on our mental health. Without positive, durable relationships, both our minds and our bodies fall apart.