The significance of this quote is Montag's realization of what his job is actually about and what it implies. He became a fireman because he was meant to. However, he is now haunted by this new feeling and does not know anymore what is right and what is wrong.
The meter from this line is pentameter, and to be more precise, this is an iambic pentameter.
Iambic means that the first syllable in the line is unstressed, and that it is followed by a stressed one. Here, you can see that DO in the beginning is unstressed, and the accent is placed on the second syllable, NOT. Pentameter means that there are five meters (penta means 5), and given that one meter consists of 2 syllables approximately, pentameter consists of 10 syllables in each line.
Answer:
In California's Yosemite National Park, the summit of the iconic El Capitan rock formation looms 3,000 feet above its base. Though El Capitan's vertical granite has always presented a challenge for climbers, its southeastern face, known as the Dawn Wall, is thought to be the most punishing.
It means live in the moment. You can't change the past, so don't worry about it. The future does depend on what you're doing now, but belive it is good.
