Which lines from Mutabiliy most reflect a similar idea

There are two lines in the poem, “Mutability” that express a similar idea:“We rest. — A dream has power to poison sleep;We rise. — One wandering thought pollutes the day;”With the changeable nature of one’s activity throughout a day, resting and rising are seen to be two sides of the same phenomenon, where one struggles with controlling one’s own subconscious thoughts.

Explanation:

answer: the time zones used to be whatever the local authority wanted them to be. one town might have 6am whenever the sun came up and another town had 6am 10 minutes later.  

the trains had a hard time when their orders said to be at a certain point at 6am.  

6am, but who's 6am.  

the railroads got together and set the time zones more or less along the longitude lines across the country.

explanation: