Therefore, if anyone is in Christ, he is a new creation; old things have passed away; behold, all things have become new.
2 Corinthians 5:16-17 (NKJV)
Not knowing who you are is a bad thing. Knowing who we really are is important and losing your memory is not something to be taken lightly. If somehow you lost your memory and completely forgot who you were it could create some major problems. But what if somehow, someone could convince you that you are not who you really are? What if you met a person who claimed you were somehow tricked into thinking you are not who you really are? If this person could convince you that your identity was something other than what it really is it would be that same as losing your memory and not knowing who you are.
In 2 Corinthians 5, Paul made an interesting comment when he said that at one time we only knew Jesus according to the flesh. Paul was saying that while he and others once only knew Jesus in a natural way that now they know Him for who He really is. Paul went on to say that from now on he would not just consider who someone is based on the natural side of life. Paul was talking about the fact that we need to see Jesus, other people, and even ourselves from a spiritual perspective. If we only know Jesus, others, and ourselves from a natural point of view we will have some problems.
Some only know who Jesus is naturally, a teacher who did some good things. But, if we know who Jesus really is and that He died on the cross for our sin that is a different perspective that will change our life! If we only see ourselves from the natural point of view, we will not know who we really are. Who we really are is found in Christ, we are a new creation in Christ. God has given us His Word to help us understand who we really are based on our true identity in Christ. If we only know about the natural side of who we are we are living under a mistaken identity and that will cause us to live below the best that God intended for us to have.