Zinthu zomwe zimathandizira thanzi la anthu. Malinga ndi ndani, zinthu izi zikuyenera kupezeka "nthawi zonse, kuchuluka kokwanira, mitundu yoyenera, yomwe ili ndi mtundu wabwino komanso chidziwitso chokwanira, komanso mdera lanu lingakwanitse".