(I'm still not very sure of the key, but I think it's Bb minor.)
Excepting the initial note of the first phrase, the two phrases have the same melodic shape and note values, so there's a parity between the two phrases in the same way that "Silence and I" are "two of the kind."
"Two of a kind" is also represented musically in that (again excepting the initial note of the first phrase) each phrase consists of two pairs of two pitches (Bb & C and C & Db).