Answer:
The two lines which determine the theme of the poem are :-
"And the song of our hearts shall be,
While the winds and the waters rave,"
The poem A Life on the Ocean Wave by Epes Sargent is about a person who is desperate to go back to his life as a sailor. He misses the "the flashing brine/The spray and the tempest's roar!" of the sea, because a sea voyage is full of dangers to overcome and adventures to conquer. The narrator cannot adjust to his life on land, as said in the poem - "Like an eagle caged, I pine On this dull, unchanging shore..". Thus, the sailor desires to go back to see with his "stout vessel and crew" to witness the "rolling sea".
