Faith is better understood as a verb than as a noun, as a process than as a possession. It is an on-again-off-again rather than once-and-for-all. Faith is not being sure where you're going but going anyway. A journey without maps. Tillich says that doubt isn't the opposite of faith; it is an element of faith.
To be commanded to love God at all, let alone in the wilderness, is like being commanded to be well when we are sick, to sing for joy when we are dying of thirst, to run when our legs are broken. But this is the first and great commandment nonetheless. Even in the wilderness - especially in the wilderness - you shall love him.
Grace is something you can never get but only be given.
A God in the hand is worth two in the bush.
Lord, I believe; help my unbelief' is the best any of us can do really, but thank God it is enough.