Lord of our lives?

When I woke up I said Good morning to our Father, Jesus and the Holy Spirit but instead of using Jesus' name I said Lord. I then pondered what it means when we call Him Lord. What should it mean? Is it just a title or a nickname we vainly say without thinking? Does that title contain any gravitas within our hearts, minds and souls? Do we really understand what we are acknowledging when we call Him the Lord of our lives? Do we grasp the full magnitude of what it cost to call Him Lord? What it cost God for the opportunity; and what it cost us? It is written "...whoever he be of you that forsaketh not all that he hath, he cannot be my disciple." Luke 14:33. Is not that exactly what the Son did for us? He left Eternity, perfect Communion with His Father and the Holy Spirit, emptied Himself of all His glory, took on the form of His own Creation and suffered more than we will ever comprehend, just to redeem us back unto Himself. So, what does it mean to you that Jesus is Lord?