Why called me Lord

(Matthew 15:8-9) "This people draweth nigh unto me with their mouth, and honoureth me with their lips; but their heart is far from me.  {9} But in vain they do worship me, teaching for doctrines the commandments of men."

(Luke 6:46-47) "¶ And why call ye me, Lord, Lord, and do not the things which I say?  {47} Whosoever cometh to me, and heareth my sayings, and doeth them, I will shew you to whom he is like:"