Donald Howard could have never predicted that his book would be such a success.
The Elderslie author penned Christians Grieve Too back in 1979 after the death of his first wife Diana.
Since then, the book has been printed 100,000 times and translated in Portuguese.
Mr Howard, a reverend, said he had “files and files” of messages of thanks from readers who had been touched by his words.
“It’s very satisfying to know I’ve helped in some way,” he said.
“It’s mostly been overseas in Europe that the book’s been popular, and it’s also been printed in Brazil.
“I had no idea how wide it would go.”
Christians Grieve Too tells of Mr Howard’s “ill-preparedness” for the grieving process.
His wife was sick, so her death was no a shock, but the nature of the grief that came after was a great shock.
“Grieving is a process and everyone experiences it differently,” he said.
“It’s not just death as well, there can be grief after divorce, the loss of a job, moving out of a family home or the death of a pet.”
In his book, Mr Howard said “the knowledge of what to expect when grief comes will better enable us to cope with it”.
He said the process “may be complicated by emotions such as guilt, anger and fear” and could last “months, even a year or two” before life once again becomes “relatively stable”.
Christians Grieve Too has been published by Banner of Truth Trust since 1980.
Mr Howard has published three other books.