As a noun:
* Self-discipline is essential for achieving your goals.
* The discipline of history requires meticulous research.
* The military enforces strict discipline among its ranks.
* The teacher used positive reinforcement to maintain discipline in the classroom.
* The discipline of learning a new language can be challenging, but rewarding.
As a verb:
* I need to discipline myself to eat healthier.
* The coach disciplined the player for breaking the rules.
* Parents discipline their children to teach them right from wrong.
* The company disciplined the employee for violating safety protocols.
* Discipline yourself to focus on one task at a time.
With different shades of meaning:
* Strict discipline can be harmful to children's development.
* The discipline of the martial arts teaches respect and self-control.
* The discipline of writing requires patience and persistence.
* She disciplined her emotions and calmly explained her situation.
* The discipline of the team was evident in their synchronized movements.
Remember to choose the best word to express the specific meaning you want to convey in your sentence.