The poem is about a child (maybe son?) who feels intimidated by their father's greatness. I can't remember who it is by. Towards the end, there is a line about how the child saw the length of the father's shadow (or something like that) "and ran".
If anyone can figure out what this poem is based on my very vague recollections, I would greatly appreciate it! I can't seem to find the right search terms on my own.