In the context of this poem, we cannot control our destiny, for this reason, the speaker has a pessimistic view of his life and destiny. This is a valid perspective from the point of view of the poem.
We can arrive at this answer because:
In this case, the speaker points out, that we would be happier if we could control our destiny, as we would only maintain happy situations in our life, but that cannot happen.
This question is about the poem "A Dream Within a Dream."
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