You shouldn't be too hard on your employees
A person that works for Bob comes in five minutes late one morning.
Bob wants to let his employee know that he doesn't like them being late.
Bob explains that it's important for everyone to be on time and asks the employee to make an effort not to be late.
Bob yells at the employee and threatens to fire them if they are even one minute late in the future.
The employee thinks Bob's reaction to their lateness is fair, and they try not to be late again.
Bob's employee thinks Bob's reaction was way to harsh, and they start to dislike working for him.