What is the theme of Wordsworth's poem, "Resolution and Independence?"

As the title suggests, Wordsworth's poem is centered on
the subjective empowering itself.  Filled with Romantic imagery, the speaker, presumably
Wordsworth, is seemingly at the pitch of prosperity when he comes across a moment in
time when he is filled with a sad melancholy.  This existential crisis causes pain in
the speaker and he struggles to identify its causes.  To no avail, his rumination is
interrupted by this old man who sits on a hill and through conversation, the speaker
realizes that this solitary vision is the embodiment of strength, totality, and a sense
of complete confidence in self.  The speaker understands, and the theme of the poem,
becomes that in times of crisis and doubt, one must find the internal strength, the
intestinal fortitude, to endure these moments and overcome them.  The notion of the
subjective self being a reservoir of strength is something that is confirmed by the old
leech gatherer, and is a lesson that the speaker learns.  The speaker understands that
to be a human being involves living with doubt, but also being able to surpass it with a
quiet confidence in one's own subjective being.  In this, the theme of the poem is
revealed, an affirmation of the subjective in all circumstances.