Training before getting married

Boy : Daddy, I want to marry.

Dad : First say sorry.

Boy : For what?

Dad : Say sorry.

Boy : But for what? What have I done?

Dad : You first say sorry.

Boy : But...What's my fault?

Dad : You first say sorry.

Boy : But Why???

Dad : You first say sorry.

Boy : Please, at least tell me a reason!

Dad : You first say sorry.

Boy : Ok Dad....I'm sorry!!

Dad : Now you're ready. Your training is complete.

When you learn to say sorry without any reason, you can marry...!