I have promised the king, and I will keep my word, that I would never enter into any cabal again, to prevent his Majesty from either removing, or bringing into his service, any person he had either a prejudice to, or a predilection for.
Source, in full
Letter to the Duke of Newcastle (7-18 September 1750), quoted in William Coxe, Memoirs of the Administration of The Right Honourable Henry Pelham, Collected from the Family Papers, and Other Authentic Documents, Vol. II (1829), p. 389