J.P. Moreland on BeliefLove God With All Your Mind (Colorado Springs: NavPress, 1997), p. 107.
It is unproductive to try to believe something beyond your grounds for believing it and dishonest to act as if you believe something more strongly than you do. Overbelief is not a virtue. For example, I am far from certain on many Christian beliefs I hold. I lean toward the view that the days of Genesis are vast periods of time and not literal twenty-four-hour periods. But about two days of the week I flip-flop and accept the literal view. Based on my study, I cannot convince myself either way… Other beliefs of mine have grown in certainty over the years — that God really exists, for example. We should be honest with ourselves about the strength of our various beliefs and work on strengthening them by considering the issues relevant to their acceptance.