Love, actually...

This something blew my head off when I heard it the first time... and since then, I've not seen this part of the movie again... Never had to... the dialogue is still buzzing in my head...
Movie: "Good Will Hunting". Sean Maguire (Robin Williams) is breaking apart Will Hunting's (Matt Damon) smugness of the previous meeting with a calculated, well thought over analysis of his behavior. This is part of what he says...
"... And if I asked you about women I'm sure you could give me a syllabus of your personal favorites, and maybe you've been laid a few times too. But you couldn't tell me how it feels to wake up next to a woman and be truly happy. If I asked you about war you could refer me to a bevy of fictional and non-fictional material, but you've never been in one. You've never held your best friend's head in your lap and watched him draw his last breath, looking to you for help. And if I asked you about love I'd get a sonnet, but you've never looked at a woman and been truly vulnerable. Known that someone could kill you with a look. That someone could rescue you from grief. That God had put an angel on Earth just for you. And you wouldn't know how it felt to be her angel. To have the love to be there for her forever. Through anything, through cancer. You wouldn't know about sleeping sitting up in a hospital room for two months holding her hand and not leaving because the doctors could see in your eyes that the term "visiting hours" didn't apply to you. And you wouldn't know about real loss, because that only occurs when you lose something you love more than yourself, and you've never dared to love anything that much."