Prepositions are cool words. This part of speech is not as easily understood as nouns or verbs, but is essential nonetheless. I commonly think of them as linking words, as their function is to link a noun or pronoun to the rest of a sentence and create a prepositional phrase.
This is especially interesting in the phrases "walking in" and "walking through." We use both at my ecclesia. These two phrases are extremely different because of the simple prepositions.
Which one do you think is temporary? That's right, walking through. "Through" implies that you'll eventually come to the end of something and leave it behind. If you're walking through a forest, eventually you will reach the other end of the forest and move on from there. You wouldn't stay in the forest forever, nor would you stop when you reached its end.
Walking in, though, doesn't have an implicit end. The goal of walking through something would be to reach another destination. The goal of walking in something is less defined. You might walk in a forest and never leave it. It could be your home. You might go in and come out of the forest at different times. It isn't really as structured as the former phrase.
What is interesting is that a person can be walking in and walking through some things at the same time. Walking in, to me, implies more permanence when it comes to spiritual things. One can walk in truth, walk in freedom, walk in faith. These are things I wouldn't want to ever stop walking in. But then, there's no need to. Freedom, faith, truth... they're all infinite and eternal. There ISN'T an end to them.
Walking through can also be termed walking out. I generally think of the latter phrase as walking out of something. One can walk out the process of being freed from a debt, thus walking out of debt. One can walk through a season in their lives in which they struggle with a lack or temptation. These things are temporary. Yahweh never created them to be eternal.
For Kingdom people, walking out something is fairly common. Yet we can always, even in the midst of this walking through, walk IN what Yahweh has for us. Or really, walk IN Yahweh. Because that's all there is in the end anyway.
And as we walk in Yahweh, Yahweh lives in us, so that, in all things, we become inextricably One.