Luther, Series 1

Alice Morgan:
Are you trying to beguile me?

DCI Luther:
[chuckles] No, I wouldn't be so foolish. But I will tell you this, Alice. You can revel in your brilliance for as long as you like, but people slip up. Happens time and time again.

Alice Morgan:
Well that's just faulty logic postulated on imperfect data collection. What if you only catch people who make mistakes? That would skew the figures, wouldn't it?

DCI Luther:
Yes, it would. But criminals aren't as smart as they think they are.

Alice Morgan:
Oh, that must get monotonous for someone as brilliant as you.