Angel: I saw you before you became the Slayer.
Buffy: What?
Angel: I watched you, and I saw you called. It was a bright
  afternoon out in front of your school. You walked down the steps...
  and...and I loved you.
Buffy: Why?
Angel: 'Cause I could see your heart. You held it before you for
  everyone to see. And I worried that it would be bruised or torn.
  And more than anything in my life I wanted to keep it safe... to
  warm it with my own.
Buffy: That's beautiful. Or taken literally, incredibly gross.
Angel: I was just thinking that, too.
	-- Helpless (Buffy the Vampire Slayer, season 3 episode 12)