Acumen

Definition: quickness of perception; keenness of mind; accurate discrimination
     See also: sagacity

Quotes:
• We can accelerate our acumen, performance, and success by leveraging our associations and spending time with people better than us. — Robin S. Sharma (1964-) Canadian Author
• Take advantage of every opportunity to practice your communication skills so that when important occasions arise, you will have the gift, the style, the sharpness, the clarity, and the emotions to affect other people. — Jim Rohn (1930-2009) American Motivational Speaker