ability to discern

inner qualities

hmmm, does not quite grasp the meaning,

so I search for another definition

knowledge of what is true + right

coupled with just judgment … sagacity

sagacity:

of keen and farsighted judgment

keen:

intellectually alert: characteristic of a quick penetrating mind

judgment:

the process of forming an opinion or evaluation by discerning and comparing

discernment:

the quality of being able to grasp and comprehend what is obscure