I have just re-read the entire Tea Party chapter and have found no such line uttered by the Doormouse. I even went back further to the mouse's tale in which there was no such line. The Doormouse was not included among the characters in Alice's Adventures Underground and I did not see it in Through the Looking Glass. So I am very much at a loss to figure where the Jefferson Airplane song got the notion that the Doormouse said such a thing. Actually, it always sounded to me more like something the Caterpillar might have said. Alas! It was such a good line; one would think it must have come from somewhere.