Wrestle with Doubts
Reading The Reason for God by Timothy Keller and found a good quote already.
Believers should acknowledge and wrestle with doubts -- not only their own but their friends' and neighbors'. It is no longer sufficient to hold beliefs just because you inherited them. Only if you struggle long and hard with objections to your faith will you be able to provide grounds for your beliefs to skeptics, including yourself, that are plausible rather than ridiculous or offensive.