Well, when I started to reply here I was pretty sure I had a few in mind... then I realized how futile trying to pick a couple of favorite U2 lines is. So I'll throw in some, then kick myself for the ones I forgot.
For starters: all of Bad, all of A Sort of Homecoming, all of The Fly, all of Zooropa (the song), all of Please, all of Like a Song and all of Numb (of course!)
- Innocent and in a sense I am / Guilty of the crime that's now in hand
- You hurt yourself you hurt you lover, then you discover / What you thought was freedom just was greed
- If you need someone to blame / Throw a rock in the air you'll hit someone guilty
- And I know it aches and your heart it breaks / You can only take so much / Walk on
- It's the stuff, it's the stuff of country songs, but I guess, yeah it's something to hold on
And finally, since no one's mentioned it yet (I don't think), all of Wild Irish Rose:
In a field by a river, my love and I did lie
And on my naked shoulder, she too proud to cry
She said that I must leave her; and icy tear she froze
How could I melt the heart of a wild Irish rose?
Well a gypsy she has made of me, a servant of the street
And back to bed I've travelled, to taste a love as sweet
Well the heart it knows no reasons, and reason never knows
As I lie with them I'm thinkin of a wild Irish rose
Well I saw the city of angels, it brought a devil out in me
And Hell's hotel on sunset showed a whore no mercy
The orange sky was screaming; from the roof I let her go
These are the dizzying heights that brought me my wild Irish rose
Red is the rose that she laid on my grave
A life was what she wanted and a life I surely gave
Like a hundred men before me, they lay lying here in rows
Young men, bloody, as a wild Irish rose.
And, of course, everything everyone else has mentioned