Ukunengeka kuwumuzwa odingekayo ukuze inja iphile ngomqondo wokuthi uyivumela ukuba ibone ukudla okunobuthi noma osekuphelelwe yisikhathi.

Ukunengeka kuxhumene nomuzwa wenja wokuhogela (unamandla kakhulu kunewethu) kodwa izinto zokunengeka kwayo ngeke zifane nezethu: iphunga eliwumshayabhuqe kubantu (indle, izidumbu, njll.) amaphunga. ukulinga izinja futhi ngokuphambene. Ngakho, iphunga lamakha lingayinengeka inja futhi liyenze ithimule.

Ukuma kokuhoxa, ukunwetshwa kwamehlo akhe ngokubonakala komhlophe kweso kanye nokujikisa ikhanda kuyizimpawu ezisikisela kakhulu zokunengeka ezinjeni.