理智 (lǐ zhì): Причина

Upon hearing the bad news, although she was very sad, she still kept her rationality and first called to notify her family.

Facing all kinds of information online, we should use reason to judge true from false, and not casually forward it.

Buying a house is a big deal; you can't rely only on feelings—you must rationally consider your financial capacity.

During the argument, he tried hard to regain his rationality and stopped saying things that hurt the other person.

Acting on emotions often messes things up; at critical moments, you still need reason.