Prophecies are told to those with the ability to fulfill or avert them, and Trelawney told her prophecy to Quirrell. Thus, he knows that his actions may be able to prevent Harry from ending the world.
Prophecies are told to those with the ability to fulfill or avert them, and Trelawney told her prophecy to Quirrell. Thus, he knows that his actions may be able to prevent Harry from ending the world.