Maslahah imeitwa Maslahah kwa sababu kujenga hukumu juu yake kunalingana na kile kinachodhaniwa kuwa ndicho kinachoweza zaidi kuleta au kupata manufaa, au kuondoa madhara. Na imeelezwa kwa neno Irsaal (yaani Mursal) kwa sababu haina Daleel Shar'iy ya kuizingatia wala ya kuifuta kutoka upande wa Shaari'. Umuhimu wake kwa wanaoitumia unaonekana katika mambo yafuatayo:

The Maslahah has been called a Maslahah because the building of a Hukm upon it is in accordance to what is thought to be most likely to bring or attain the benefits or repel the harms. And it has been described with Irsaal (i.e. Mursal) because it is devoid of a Daleel Shar’iy for its consideration or its cancellation from the side of the Shaari’. Its significance for those who use it is seen in the following matters: