Answer:
The concept of freedom will never cease to exist.
Explanation:
"For though the coal may sometimes cease to shine [freedom seems out of reach], the coal can never expire [that freedom is still always there]."
I am not sure which poem you are referring to here, but one poetical technique is called enjambment. This occurs when a line continues to the next line without a pause. Even if there is a stanza break in between, the lines are meant to be read continuously. For example, consider these lines from a poem by William Wordsworth called Beauteous Evening:
"The holy time is quiet as a Nun
Breathless with adoration; the broad sun
Is sinking down in its tranquility"
Here, Wordsworth is not intending that you pause after you read "Nun" or "sun." He wants you to read these lines as a continuous sentence or thought. Hope this helps.
Metaphor: because there is a comparison between the treasures spread on the ground and the evil seed of Adam drifting from the shoreline
