وهو الذي يمكن التوصل بصحيح النظر فيه إلى العلم
That through which knowledge can be reached by correct reasoning.
Naẓar involves attending to known premises in a way that makes a conclusion accessible. Complexity or length by itself does not make a proof valid.
“All humans are mortal; Zayd is human; therefore Zayd is mortal” illustrates a conclusion entailed by its premises. “Zayd is human; therefore he is necessarily a jurist” does not. Valid reasoning requires suitable premises and a conclusion that really follows from them.