The Ability to Think & Behave in a Rational Manner

This page is the CodyCross answer for the clue below from La Bella Roma, Group 419, Puzzle 5 (Trevi Fountain).

Question is: The Ability to Think & Behave in a Rational Manner

and the answer is: SANITY

Word Meaning:

SANITY — The condition of being sane.

Definitions from Wiktionary.