I can only go by what Jesus said. Just because you call Him Lord, Lord, doesn't mean I should trust your words over His.
23 And then will I profess unto them, I never knew you: (You that call Me Lord, Lord) depart from me, ye that work iniquity.
46 And why call ye me, Lord, Lord, and do not the things which I say?
23 Jesus answered and said unto him, If a man love me, he will keep my words: and my Father will love him, and we will come unto him, and make our abode with him.24 He that loveth me not keepeth not my sayings: and the word which ye hear is not mine, but the Father's which sent me.
48 Be ye therefore perfect, even as your Father which is in heaven is perfect.
23 And then will I profess unto them, I never knew you: (You that call Me Lord, Lord) depart from me, ye that work iniquity.
46 And why call ye me, Lord, Lord, and do not the things which I say?
23 Jesus answered and said unto him, If a man love me, he will keep my words: and my Father will love him, and we will come unto him, and make our abode with him.24 He that loveth me not keepeth not my sayings: and the word which ye hear is not mine, but the Father's which sent me.
48 Be ye therefore perfect, even as your Father which is in heaven is perfect.
I believe God's Grace has worked in my heart to discern this. So what is the iniquity Jesus is talking about? I am convinced it was relying on THEIR works, which are filthy rags, instead of His Work on the cross.
An example of these people could be Jehovah's Witnesses. I have personally seen them do great works for the poor and destitute, preach jesus, and (by human thinking) live godly lives. Yet we all know they don't profess the Jesus of Scripture. Not believing He is God in the Flesh and other heresies. It seems to me that they could be of those that say"Lord, Lord....".
Also, it cannot be emphasized enough, that Jesus NEVER knew them, or maybe clearer, made a new creation in them. Jesus didn't say" I knew (created a new heart) you at one time, but between the sins you committed after that, and the lack of works you did, depart from me and enter hell"