The quality or state of being → wise; knowledge of what is true or right coupled with just judgment as to action; sagacity, discernment, or insight (Dictionary.com). Wisdom is gained over the years through experience. It is the insight in knowing the probable outcome learned through experience. In contrast, → reason is using the → rational → reasoning to evaluate pros and cons in making a decision.
Xerad "understanding, judjement, intellect, wisdom;" Mid.Pers. xrad "reason, intellect, intelligence, wisdom, understanding;" O.Pers. xraθu- "wisdom;" Av. xratu- "intelligence, understanding, wisdom; will, purpose, council;" cf. Skt. krátu- "power, will-power;" Gk. kratos "power, strength."