Question

Why have the lines -"For men may come and men may go but i go on forever" being repeated in the poem several times . what is the significance of this line

Answer 1

Here the line means many men will born any die but I the river will be for ever

Answer 2

For men may come and men may go but I go on forever is a refrain in the poem so it is repeated many times. this line describes the permanentnes of the Brook and the temporary aspect of human life.