At the root of tolerance is the notion that one is permissive, not about one's own beliefs, but about the beliefs of those with whom one disagrees. If you do not know who you are and what you hold to be true, you cannot be tolerant.
[Quote found, Apr. 22, 2007, Father Robert A. Sirico, "The Catholic Identity Crisis." National Review (April 17, 2009..Source: The Catholic Resource Centre).