Sufi Master Pir Vilayat Inayat Khan advised his students about the pain we all have and carry with us and share through life.
Not directly-quoted, as there are many versions from various sources:
Overcome any bitterness…
because you were not up to the
magnitude of the pain
entrusted to you.
Like the mother of the world who carries the pain of the world in her heart,
you are sharing in the totality of this pain
and are called upon to meet it
in compassion and joy
instead of self-pity.