So I tell you this, and insist on it in the Lord, that you must no longer live as the Gentiles do, in the futility of their thinking. They are darkened in their understanding and separated from the life of God because of the ignorance that is in them due to the hardening of their hearts. (Eph 4:17-18)
Once we step into light we realize how dark it has been in our lives.
Apprentice 2 Jesus 
And that realization is the scariest of things.
Amen