PROFESSOR McGONAGALL
So to be clear – you illegally jumped off the Hogwarts Express, you invaded and stole from the Ministry of Magic, you took it upon yourself to change time, whereupon you disappeared two people—

ALBUS
I agree it doesn’t sound good.

PROFESSOR McGONAGALL
And your response to disappearing Hugo and Rose Granger-Weasley was to go back in time again – and this time – instead of losing two people you lost a huge number of people and killed your father – and in doing so you resurrected the worst wizard the world has ever known and heralded in a new age of Dark Magic. (Dry.) You’re correct, Mr Potter, it doesn’t sound good does it? Are you aware how stupid you’ve been?

SCORPIUS
Yes, Professor.

ALBUS hesitates a moment. He looks at HARRY.

ALBUS
Yes.

Harry Potter and the Cursed Child - Chapter 3 :
See this quote in the Pensive -