Final answer:
In the book 'A Grief Observed' by C.S. Lewis, he mentions the great gulf that exists between grief and the rest of the world.
Step-by-step explanation:
In the book A Grief Observed by C.S. Lewis, he specifically says that no one ever told him about the great gulf that exists between grief and the rest of the world.
He expresses that grief is a deeply personal and isolating experience, and that others may not understand the profound impact it has on an individual.
Lewis highlights the inability to fully communicate or bridge the gap between a person's grief and the understanding of others.