I've now read The Hobbit, LoTR, Silmarillion, Children of Hurin and Unfinished Tales. The only time I've seen Cirdan actually quoted was in the Unfinished Tales: Essay on the Istari. Talking about the conversation between Cirdan and Gandalf:
'For' he [Cirdan] said, 'great labour and perils lie before you[Gandalf], and lest your task prove too great and wearisome, take this Ring for your aid and comfort. It was entrusted to me only to keep secret, and here upon the West-shores it is idle; but I deem that in days ere long to come it should be in nobler hands than mine, that may wield it for the kindling of all hearts to courage'.
Is this the only recording of Cirdan actually speaking?