What is faith like?

Theology classes are continuing, and one of the people in my class the other day was musing that his faith is like a glass house, and studying the Bible and theology was like throwing stones at his faith house, so that now he was losing his certainty and didn't know what to believe anymore.

I must say that I was somewhat taken aback. Certainly Bible college is challenging, much of what we are learning I am finding unexpected, but hardly faith-destroying. I couldn't help thinking that a "glass house" is not how I care to think about my faith. It implies something fragile, brittle, to be protected and not challenged. Something where one crack might cause the whole edifice to come crashing down. Someone else described faith as a house of cards - a similar simile with the same drawbacks.

I prefer to think of faith as a rose bush. It goes through seasons of dryness, seasons of flowering, seasons when pruning is needed to make it more productive. If it ever stops growing, it dies. The longer it lives, the bigger and more productive it becomes. Obviously we are not talking here about a rose bush under my care (which would have a very short life) but a metaphorical rose bush, cared for by God, which is watered, pruned and challenged as needed to make it grow.

I would like to think that my faith is like that.