Inspector Goole Quotes Act 1

English Lit: AQA GCSE An Inspector Calls, topic 5.6.1

Inspector Goole - Key Quote (Act 1)

‘A chain of events’. Here's an analysis of this key quote from Act 1:

Inspector Goole shows that, while a single action might not have dire results, the build-up of a series of bad events (caused by the Birlings and Gerald) can ultimately lead a young girl to suicide.
In this way, Priestley encourages the audience, and the characters, to think about the role they play in other people’s lives.
He encourages them to think carefully about the dangerous effect their actions can have if they do not think of others and abuse their power.

What's Priestley encouraging his audience to think about with the quote ‘a chain of events’?
‘A chain of events’ - What act is this quote from?
Who says 'a chain of events’?