It means: we are never satisfied with what we have; we always want more.
It was a quote said by Carleton Noyes "Poetry: General Introduction" from Lectures on the Harvard Classics, 1914
if you are asking what it means it can be interpreted as how humans always want more no matter what and can not settle for what is given to them in this case humans are seeking a better life then he one that has been "given" to them or in simpler terms the life that they have
yes because it is a human heart
The cow heart is bigger than the human heart.
the artificial heart is used to save human life when a human's heart fails.
Nope. The human heart is a muscle not an organ.
It has 4 chambers in the human heart
God created the human heart. He is amazing!
A frog's heart has only three chambers, and a human's heart has four chambers.
There are four chambers in a human heart.
The size of a human heart will be equivalent to the size of his/her fist.
Map of the Human Heart was created in 1993.