I was in close connection with the late Duke of Devonshire, on matters of virtù, for some time before he died, and had just obtained his confidence to so absolute a degree as to have employed it to many noble purposes. I had more than half persuaded him, in the ingenious bagatelle way, to cause dies to be engraven for a series of medals of the Dukes of Devonshire. And in the last conversation I had with him, just before he became stricken, I said to him, that I had found the inscription, though not the subject for the reverse of the medal for the first Duke of Devonshire, DOVBLE OR QVITS, at which we both laughed heartily. For he had feelings, feelings too sensible, and died under them.
...
Our meetings past from seven to nine in the morning; had he not made matters easy to me, having not a single bye-view, I could not have given in to the connection.'
(Blackburne 1780, vol. 1, pp. 171-3; Burnett 2020b, p. 1645)