Answer: The statement "He labored hard and failed at last, his sails too weak to bear the blast, the raging tempests tore away, and sent his beating bark astray." is illustrated by the metaphor of bark.
Explanation: The poem "He had his dream" is about a very optimistic man, who waits patiently for dark times to end. He uses the metaphor of a "bark" to reference his dreams, stating that good times will eventually come. However, in the statement; "He labored hard and failed at last, his sails too weak to bear the blast, the raging tempests tore away , a and sent his beating bark astray", he makes the reader create a picture of how can dreams also fail, since the windstorm (the bad times), took his luck and dreams from him.