"In the narrowest nest in a corner, My wings pressing close to my side."
"Wings" in this poem symbolize a person's abilities. In the first stanza, they keep their wings by their side. The person doesn't think they can succeed. In the third stanza, the wings are open and ready for flight. The person realizes their potential.
"I battered the cordons around me And cradled my wings on the breeze Then soared to the uttermost reaches With rapture, with power, with ease!"
The "horizon" symbolizes a dream or goal that the person wants to achieve.
"But I sighted the distant horizon Where the skyline encircled the sea And I throbbed with a burning desire To travel this immensity."