Well here the author says that inner voice of us reveals our feelings, regrets in other words what we live in our life is reflected inside of us. So he gives the example of water .Like our life, it runs quickly and our life also one day will be cut off which means it 'll come to an end. So this sheet of water is one of the pages of our life which is one part of in our long life journey.
An
example of the poetic technique called metonymy from the poem “I knew a
Woman is: "These old bones live to learn her
wanton ways”.
Metonymy refers to the replacing of the name of an adjust or
attribute for that of the thing meant.
