Ever had someone accuse you of wrongdoing because you have not kept the Sabbath? Had them remind you that it is one of the ten commandments? Ever had enormous feelings of guilt?
"How great is the love the Father has lavished on us, that we should be called the children of God!" says John, but do we know who our Daddy is? It is easy to acknowledge that we are His children, but we don't always think about WHO it is that is our Father.