Robert Murray M'Cheyne's most famous quote is some variation of:
"My people's greatest need is my personal holiness"
(J. I. Packer, Ajith Fernando, Robert E. Coleman, Don Carson)
“The greatest need of my people is my personal holiness.”
(Jason Helopoulos, mcheyne.info)
"The greatest need of my people is my own holiness"
(John Piper)
The only problem is - did he actually say it? None of those listed above actually reference it - and I can't find anyone on google that does.
I have M'Cheyne's works in Logos (including his biography by Bonnar) and can't find it. He writes to W. C. Burns about personal holiness in ministers and says things like:
"I feel there are two things it is impossible to desire with sufficient ardor—personal holiness, and the honour of Christ in the salvation of souls."
"Are we never afraid that the cries of souls whom we have betrayed to perdition through our want of personal holiness, and our defective preaching of Christ crucified, may ring in our ears for ever?"
But nowhere does he even use the phrase "greatest need" (or great need, chiefest need etc)
I've also searched Smellie's biography of him which is on archive.org.
Anyone have any ideas? It seems that the quote is too famous for M'Cheyne not to actually have said it - but I'm beginning to have my doubts.