The second manifesto was written in 1973 by Paul Kurtz and Edwin H. Wilson, and was intended to update the previous one. It begins with a statement that the excesses of Nazism and world war had made the first seem "far too optimistic", and indicated a more hardheaded and realistic approach in its seventeen-point statement, which was much longer and more elaborate than the previous version. Nevertheless, much of the unbridled optimism of the first remained, with hopes stated that war would become obsolete and poverty would be eliminated.
Initially published with a small number of signatures, the document was circulated and gained thousands more, and indeed the AHA website encourages visitors to add their own name. A provision at the end that the signators do "not necessarily endors[e] every detail" of the document, but only its broad vision, no doubt helped many overcome reservations about attaching their name.
One of the oft-quoted lines comes from this manifesto is, "No deity will save us; we must save ourselves."