Tim Keller, in The Reason for God, argues why it is profitable to trust in Christ even when you don’t have it all figured out.

This is good news for the doubter, for at one time or another, all of us, even those who call ourselves “Christians,” come to a point in life where we wonder if everything we think we believe is real. According to Keller, our faith can co-exist in the midst of the doubts, so long as we have faith in the right thing:

The faith that changes the life and connects to God is best conveyed by the word “trust.” Imagine you are on a high cliff and you lose your footing and begin to fall. Just beside you as you fall is a branch sticking out of the very edge of the cliff. It is your only hope and it is more than strong enough to support your weight. How can it save you? If your mind is filled with intellectual certainty that the branch can support you, but you don’t actually reach out and grab it, you are lost. If your mind is instead filled with doubts and uncertainty that the branch can hold you, but you reach out and grab it anyway, you will be saved.

Why?

It is not the strength of your faith but the object of your faith that actually saves you. Strong faith in a weak branch is fatally inferior to weak faith in a strong branch.

Let’s not make the terrible mistake of believing in our ability to believe. That is weak branch indeed.