自律 (zì lǜ): วินัยตนเอง

He insisted on getting up at 5 a.m. to study every day; this self-discipline helped him pass the exam smoothly.

To stay healthy, she is strictly self-disciplined: she avoids sweets and exercises four times a week.

Although he is very busy with work, he is very self-disciplined and finds half an hour to read every day.

Students lacking self-discipline often procrastinate on homework, while self-disciplined students can finish on time.