The title 'Lord' was used in addressing the Lord Jesus Christ in prayers. Prayer is worship in which the word 'Lord' should be addressed to God only. Regarding this the Lord Jesus Christ said in the Sermon on the Mount: "Not everyone who says to Me, 'Lord, Lord,' shall enter the kingdom of heaven, but he who does the will of My Father in heaven" (Matt. 7:21). Here, the Lord says that prayers addressed to Him without good deeds are in vain. The same meaning is conveyed when He said: "But why do you call Me 'Lord, Lord, 'and do not do the thingswhich I say?" (Lk. 6:46)