Answer:
life......................................
You can use the fourth verse. below is an interpretation of the verse.
when we are divided or separated
we sorrow or we hurt
we shall be joined in heart(maybe not physically but the person that passes forever holds a special place in someone's heart.)
but hope to see each other again.
Fahrenheit 451 is set in an unspecified city at an unspecified time in the future after the year 1960. The novel is divided into three parts: "The Hearth and the Salamander", "The Sieve and the Sand", and "Burning Bright".