sagacity (noun) 

Sagacity (suh-GAS-ih-tee) is the quality of being discerning, having the ability to make good judgments. As I used it today: “He’s a good writer. His stories are compelling. But I’ve always wondered if he isn’t worried that this never-ending chronicle of screw-ups might diminish his credibility. Would it make his readers question the sagacity of his advice?”