Maana ya maisha
Kulingana na Utu wa Kidunia, wanadamu walitokana na kuzaana katika maendeleo ya mabadiliko ambayo hayakuongozwa kama sehemu muhimu ya maumbile, ambayo huishi yenyewe.<ref name=humanifesto1>{{cite web |title=Humanist Manifesto I]   url=http://www.americanhumanist.org/about/manifesto1.html |work=American Humanist Association |year=1933 |accessdate=2007-07-26}}</ref><ref name=humanifesto2>{{cite web |title=Humanist Manifesto II work=American Humanist Association |year=1973 |url=http://www.americanhumanist.org/about/manifesto2.html |accessdate=2007-08-01 |archiveurl=https://web.archive.org/web/20070809102124/http://www.americanhumanist.org/about/manifesto2.html |archivedate=2007-08-09 }}</ref> Maarifa hayatoki katika vyanzo vyenye nguvu visivyo vya kawaida, lakini kutoka uchunguzi wa binadamu, majaribio, na uchambuzi wa kimantiki (mbinu ya kisayansi): asili ya ulimwengu ni kile ambacho watu huitambua kuwa hivyo. Aidha, maadili na ukweli vinalengwa kwa njia ya uchunguzi wa kiakili na yanatokana na mahitaji ya binadamu na hamu kama ilivyopimwa na uzoefu, yaani kupitia akili yenye uchambuzi.<ref name=humanifesto3>{{cite web |title=Humanist Manifesto III work=American Humanist Association |year=2003 |url=http://www.americanhumanist.org/3/HumandItsAspirations.php |accessdate=2007-08-01 |archiveurl=https://web.archive.org/web/20070809103515/http://www.americanhumanist.org/3/HumandItsAspirations.php |archivedate=2007-08-09 }}</ref><ref name=CDSH>{{cite web |title=A Secular Humanist Declaration work=Council for Democratic and Secular Humanism (now the Council for Secular Humanism) |year=1980 |url=http://www.secularhumanism.org/index.php?section=main&page=declaration |accessdate=2007-08-01 |archiveurl=https://web.archive.org/web/20080817084107/http://www.secularhumanism.org/index.php?section=main&page=declaration |archivedate=2008-08-17 }}</ref> "Kulingana na yale tunayojua, tabia za mtu kiujumla ni [chanzo cha kiumbe cha kibiolojia kinachoendesha shughuli zake katika muktadha wa kijamii na wa kiutamaduni."