To repeat this idea so many times in the passage reinforces that faith is acting on what we do not see. Essentially it means that we trust God with what He has revealed to us, even though we cannot see how in the name of all that is Holy what He has said is going to be done. Regardless, we trust.
I am facing one of those times now. I am working on a project that is not coming together. I am relatively sure that the Lord has directed me to do this. But in the past few days there has been a continual stream of wrenches thrown into the gears.
If my understanding of this passage is correct, and it is the case that the Lord is directing, it is not my job to figure out how to make it all work. That, by the way, is my default position. Rather, my job, my assignment, my task is to trust God for what I do not see.
None of the flying wrenches took Him by surprise anyway. I just need to have faith in the unseen. For me that is not an easy assignment.