This paper argues that the source of a letter of Valentinus quoted by Clement is to be found in a fourth century letter collection with a more orthodox pedigree. So far as I can tell, only two writers have noticed this connection, but for rather poor reasons have regarded it as dependent on Clement's source. I contend that (i) Clement's citation practices, (ii) the incoherence of the quotation in Clement and its coherence within the 4th-c. letter, and (iii) other distinctive theological features of the letter make it more likely to have been Clement's source.