素质 (sù zhì): quality, caliber

He demonstrated strong inner qualities in the interview, not only answering questions clearly but also proactively helping other nervous job seekers.

The waitstaff at this restaurant have high inner quality; even when customers have a bad attitude, they remain polite and patient.

To improve the inner quality of all citizens, we need not only to develop education but also for each person to start with small daily actions, such as queuing to board and not spitting everywhere.

Although she doesn't have a high degree, her inner quality is excellent, and colleagues are all willing to work with her because she is always punctual, responsible, and respectful to others.