Your True Self
The LORD saw how great man's wickedness on the earth had become, and that every inclination of the thoughts of his heart was only evil all the time. Genesis 6:5
Our own righteousness is as filthy rags - it is only by having Jesus Christ living inside of us can there be any good found.
For a complete explanation of the New Age concept of the "higher self" or the "true self" read For Many Shall Come in My Name by Ray Yungen.