The speaker seems to be pretty wise. After all, he or she knows if we hang out long enough, we’ll get used to the darkness all around us. They also see the results of our struggles against uncertainty, and how it can sometimes result in a few bumps and bruises. But that’s about all we know about the speaker. Just who is this all-knowing person?
Consider the use of “We” throughout the poem. Could the speaker be one of us? We’re there in the dark, groping around, getting hit in the head by branches, and finally finding our way. Maybe the reason we never find out the identity of the speaker is that it isn’t important; the speaker could be any (or all ) of us. After all, uncertainty is a universal condition.
In the end, whoever they are, they’re of the opinion that all it takes to overcome uncertainty is a little gumption and a little time. In the end, whatever surrounds us is no match for our bravery, even if it leaves us a little battered and unsteady.