Well I define fundamentalism as the attempt to impose a
single 'truth' on a plural world. And what really lies behind it
is fear, a profound insecurity that makes you feel when you
meet someone who is not like you, or doesn't agree with you,
that that challenge is a threat against your very being.
Aggression is always a sign of insecurity. And insecurity is
always, at bottom, a lack of faith, not a presence of faith.

~ Rabbi Jonathan Sacks