1 John 1:5-7 - If we claim to have fellowship with God, yet walk in darkness, we are not living the truth! In a contest between light and dark, light always wins.
Therefore, to have God in our lives means we have him in all the parts. He is not just a part, he is part of all of the parts.
Kids were read a parable about a prince who brought a beggar home to live in his father's castle. As the prince grew up and became king himself, he limited the beggar to his own room and to the courtyard. The beggar became a great friend and help to the king's court, but the king himself had little to do with him. Near the end of the king's life, he revisits the beggar and discovers that, strangely, the beggar has not aged since the day he met him as a boy. The beggar expresses his wish that he could have been fully part of the king's life for all these years.
In this parable, the castle represents our lives. We might let the drawbridge down and bring God in, but sometimes we keep him confined to certain "rooms" or limited parts of our lives. God is able and willing to fill the rest of our lives, but we have to allow him to be part of our family life, our thoughts, our attitudes, our friendships, our hobbies, etc. in order to realize his full blessing.
