"Well, you know, it's an evil thing, this attempt to reverse the process of mourning." The Canon stepped back on to his own territory and became a different being. "Mourning is not forgetting," he said gently, his helplessness vanishing and his voice becoming wise. "It is an undoing. Every minute tie has to be untied and something permanent and valuable recovered and assimilated from the knot. The end is gain, of course. Blessed are they that mourn, for they shall be made strong, in fact. But the process is like all other human births, painful and long and dangerous. This attempt to reverse it when the thing is practically achieved, that is wicked, an attempt to kill the spirit."
So says Canon Avril, in "The Tiger In The Smoke" by Margery Allingham