sageness

The quality or state of being sage; wisdom; sagacity; prudence; gravity. Ascham.

noun

1. Skill in perceiving, discriminating, or judging: acumen, astuteness, clear-sightedness, discernment, discrimination, eye, keenness, nose, penetration, perceptiveness, percipience, percipiency, perspicacity, sagacity, shrewdness, wit. See ability/inability, careful/careless.
2. Deep, thorough, or mature understanding: insight, profundity, sagaciousness, sagacity, sapience, wisdom. See wise/foolish.