What, according to Kant, are the roles of displeasure and pleasure in our experience of the sublime?

What, according to Kant, are the roles of displeasure and pleasure in our experience of the sublime?

You may like to refer to Kant’s account of the purposiveness (and contrapurposiveness) of the two types of sublime.

You may also compare and contrast with Aristotle’s and/or Nietzsche’s accounts of the purpose of negative feelings in your answer.