Do you love your child so much that you would do everything for them, give in to their wishes and let them charter your lives?
Or do you love your child so much that you would instill a strong foundation for the child to grow up to be a person of strength, character and determination?
While I loved Z and X very much, I would still be impartial and firm with them, even if it meant disciplining with the rod (for Z at the moment).
In this retrospect, I wondered if I had not loved them deep enough to feel bad about lifting the hand on them. Or that I had loved them too much that I could not bear seeing them behave in a wayward manner?