Rob Bell:

Two people can believe the same thing but hold that belief in very different ways.  You can believe something with so much conviction that you'd die for that belief, and yet in the exact same moment you can also say, "I could be wrong..."  This is because conviction and humility, like faith and doubt, are not opposites; they're dance partners.  It's possible to hold your faith with open hands, living with great conviction and yet at the same time humbly admitting that your knowledge and perspective will always be limited.

What We Talk About When We Talk About God, p. 93