Answer:
The two lines in the poem which help the readers to determine the theme of the poem are: A life on the ocean wave / A home on the rolling deep.
Explanation: The lines determine that the life is on the ocean and the home lies above the depth of the ocean. Time passes by glimpses of the water.
<span>The purpose of a character foil is to offer a contrast to another character, usually the protagonist. This, thereby, helps deepen the foiled character's personality, since he has something to battle against, to essentially fight for his values and/or methods. Basically, it heightens the characterization of the other character. </span>