Within the Velveteen rabbit what is the author referring to when she says "That's why it doesn't often happen to people who break easily, or have sharp edges, or who have to be carefully kept"

This is my favorite passage in the entire book and is the message I think the book is trying to teach. I believe the author is referring to internal features: That in order for any of us to become 'real' we need to let down our guard and any false pretenses, become transparent to those around us, and put others before ourselves. Those people who walk around with a chip on their shoulder (sharp edges), those who are spoiled and only want what is best for themselves without regard to others (those who have to be carefully kept ) and those who aren't willing to hang in there when the going gets rough (those who break easily) are never really 'real' because their main focus is on self and not on others. Not sure is this helps, but it is what that passage means to me.