God is the King of glory because He is the ultimate personification of perfection, Holiness, goodness, might, authority...etc. When we worship God we need to think of all these attributes and realize that it is really unfathomable and also very humbling that we the creatures who are so limited, and imperfect are allowed to communicate with Him and call Him Abba. God's glory come to fill our lives when we worship Him in Spirit and in truth, because where the Spirit of the Lord is there is freedom, the Spirit helps us to be gradually transformed to the image of Jesus and be delivered from the ways, beliefs and authority of the worl, thus reflecting more and more His glory to those around us.