Answer: wisdom
Explanation: The usual noun form of the adjective “wise” is “wisdom” (an irregular formation from Old English). “Wiseness” is grammatically possible (formed with -ness) and appears occasionally, but it is rare and often sounds awkward or archaic. Use “wisdom” in almost all contexts: e.g., “She gained wisdom from experience.” You might only choose “wiseness” for a deliberate poetic or stylistic effect.