One of the kindest, most loving things you can do for others is to know yourself so well that you are willing to say no to unhealthy behavior or thought patterns in them with humility instead of fear, resentment or arrogance. To be strong enough to say no when the other person is not, is to know, respect, and protect your own boundaries. Understanding your own personality helps you identify ways to work more effectively with those around you and build them up while not letting them tear you down.