You should punish students that steal your things.
Stacy is an elementary teacher who has a student who went into her purse and stole $10.
Stacy wants to avoid discouraging the student.
Stacy talks with the student about the consequences of his actions, then punishes him.
Stacy talks to the student and decides not to punish him so that he will self-correct.
The student learns from the talk and refrains from stealing again.
The student thinks that he can get away with stealing and develops a stealing habit.