Faith and longing

I once heard a preacher talking of faith and using an aeroplane as an illustration. He made an assumption, as preachers often do: He said, when you drive past the airport and see planes taking off, you don't think - I wonder how that stays in the sky - you just have faith that it does. I didn't altogether agree with his premise. Furthermore, when I see an aeroplane taking off, I usually think, I wonder where that's going and I wish I was on it!
The ascending aeroplane speaks to me not so much of faith but of longing.
And, it seems, longing is more likely to lead to a striving than any blindness of faith.
I never did like to conform just to fulfill a preacher's assumption!