Imitation's the sincerest form of flattery.
"One Maid's Mischief"
George Manville Fenn
I imagine that you understand it anyhow, so far as he is concerned, so I simply assure you that our gratitude here is of the strongest and sincerest kind.
"The Letters of William James, Vol. II"
William James
He got up to leave, and with the sincerest of respect, lied to her.
"Evil Out of Onzar"
Mark Ganes