When we get a sense of the nonexistence of the self, we might feel afraid. However, there is no need for fear. If the self were to exist, we could be harmed, but since the self does not exist, there is no "I" to be harmed. With the realization that the self does not exist comes great courage, and fear simply disappears.
--THE TRADITION AND PRACTICE OF VIPASHYANA -- by Venerable Khenchen Thrangu Rinpoche, Bodhi Magazine, Vol. 7, No. 4