Pain is the hammer of the gods to break
A dead resistance in the mortal's heart,
His slow inertia as of living stone.
If the heart were not forced to want and weep,
His soul would have lain down content, at ease,
And never thought to exceed the human start
And never learned to climb towards the Sun.
- Sri Aurobindo
("Savitri", Volume 29, P. 443)