Jeremy Bentham 
Deontology; Or the Science of Morality [PDF ebook] 
In Which the Harmony and Co-Incidence of Duty and Self-Interest, Virtue and Felicity, Prudence and Benevolence, Are Explained and Exemplified

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. This work was in the course of preparation for the press when its great Author’s earthly labors were suddenly closed. He had, up to the latest period of his existence, been accustomed to record the desultory thoughts which occurred to his mind on the important subject of which the volume treats; and I had the advantage, in my intimate communion with him, of seeking such guidance from him as was necessary for the understanding and arrangement of the mass of undigested fragments which he from time to time placed in my hands.