"It was the nature of his profession that his experience with..." — Cormac McCarthy quote meaning

It was the nature of his profession that his experience with death should be greater than for most and he said that while it was true that time heals bereavement it does so only at the cost of the slow extinction of those loved ones from the heart's memory which is the sole place of their abode then or now. Faces fade, voices dim. Seize them back, whispered the sepulturero. Speak with them. Call their names. Do this and do not let sorrow die for it is the sweetening of every gift.