Jeremy Bentham, An Introduction to the Principles of Morals and Legislation, Second Edition, London, 1823, Chapter 1, paragraph I.

This text of the IPML was scanned in from the 1907 Oxford edition (Oxford at the Clarendon Press, London, 1907). That, in turn, was a reprint of the 1823 edition, the last done in Bentham's lifetime. The cited passage is on page 2 of the 1907 Oxford edition.