The Father, the Son, and the Holy Spirit are all in each other, for they are one as God. This perfect oneness or union has existed from the very beginning (if there ever was one). We become one with God, as we submit ourselves to the Lord completely—it is the union between the creator and his creatures. Due to our sinful nature, it is not perfect, but it's the best we can attain on earth. This union creates an intense longing for God in us, as we yearn to perfect our union with him in heaven. For all faithful Christians, the best is yet to come.