Answer:
1. This is a quote from Edith Hamilton's Mythology, a book in which she describes different Greek, Roman, and Norse myths. This quote refers to the myth of Pyramus and Thisbe, who despite not being able to see or touch each other because they were separated by a wall would keep their love for each other alive by whispering through the wall.
2. It means that no matter the obstacles, Pyramus and Thisbe´s love prevails because love is a persistent force that can´t be restrained.
Explanation:
3. This quote is an example of a metaphor. A metaphor is a literary device that compares two different things that have a similar feature or characteristic. In this case, love is compared to a flame. Both love and fire can not be constrained, as they become stronger when efforts to cover them or stop them are made.