Maru Mori brought me a pair of socks knitted with her own shepherd's hands, (1-5)
These lines show just how un-fancy this ode is going to be: the gift is homemade, and the person who made it is a shepherd. It doesn't get much humbler than that.
They were so beautiful that for the first time my feet seemed unacceptable to me, (34-38)
The beauty of the socks in these lines humbles the speaker, in the sense of feeling unworthy. In comparison to their beautiful wrappers, the feet are humiliated. But, hey, since when is anyone that proud of their feet?
two tired old fire fighters not worthy of the woven fire of those luminous socks. (39-45)
We get more unworthiness here, as the socks get greater and the feet get humbler. Soon they'll be bowing down to the socks like Wayne and Garth!
twice beautiful is beauty and what is good doubly good when it is a case of two woolen socks in wintertime. (81-88)
The first four lines of this quote are about the lofty poetic ideals of beauty and goodness, so the last three lines are sort of a humble surprise, since it turns out that beauty and goodness are defined as woolen socks. Gotcha!