Your pain is the breaking of the shell that encloses
your understanding.
Even as the stone of the fruit must break, that its
heart may stand in the sun, so must you know pain.
And could you keep your heart in wonder at the
daily miracles of your life, your pain would not seem
less wondrous than your joy;
Continuing his lines about the necessity of pain for growth, Kahlil draws another comparison: that of a fruit stone, such as  that of a peach, avocado, or plum, must first break, so that the seedling (its “heart”) can breach the soil and reach the sun, which sustains it. This is no doubt a difficult process, but it’s also a miraculous one. 

On Pain