Why Do People Come Into Your Life?

I don't know. I'm still figuring this one out. It was the main topic of my mind today. I feel like people come into your life to change, show, & teach. Some may stay & some may go, but nonetheless, they came into your life for a reason. Sometimes, It'll seem like they were sent from the Most High, too. But I like the fact that this does happen in life. Even though it could be good or bad, I'm enjoying it.