HARRY
I thought for a long time I wasn’t a good enough dad for you because you didn’t like me. It’s only now I realise that I don’t need you to like me, I need you to obey me because I’m your dad and I do know better. I’m sorry, Albus. It has to be this way.

Harry Potter and the Cursed Child - Chapter 2 :
See this quote in the Pensive -