Jesus makes a rather frightening statement in His sermon when addressing those who claim He is their Lord (Matthew 7:21-23). He states there will be people who think they are serving Him, but, at the judgment day, Jesus will say to them “depart from Me, you who practice lawlessness.” Why? Because they had not obeyed the will of the Father.
Attempting to show high esteem and respect for Jesus, many people will address Him as, “Lord, Lord.” They will tell Jesus all the things they have done “in [His] name.” Thinking they will “enter the kingdom of heaven,” Jesus says they will not enter. Jesus is emphasizing that obedience is more important than confessing Jesus as Lord.