Gaius and Merlin in “A Remedy to Cure All Ills”

It's all ridiculous. I didn't save Uther. You did.

No, no. For once, I'm happy for someone else to take the credit. You were prepared to sacrifice your life to save me.

Where do you get that from?

I thought...

No. I didn't do anything. You saved me and you saved Uther. Maybe you are a genius.

You think so?

Well, almost. One day.