"To have genuine sincerity is absolutely necessary in the spiritual life. Sincerity encompasses the qualities of honesty, genuineness, and integrity. To be sincere does not mean to be perfect. In fact, the very effort to be perfect is itself insincere, because it is a way of avoiding seeing yourself as you are right now. To be able and willing to see yourself as you are, with all of your imperfections and illusions, requires genuine sincerity and courage. If we are constantly trying to hide from ourselves, we will never be able to awaken from our illusion of self." 
(Adyashanti)