Apophis and Col. O'Neill in “Unfinished Business”

I am worth far more to you than you will admit.

You tell me what are you worth?

Your people, they are still primitive. They will be destroyed.

You don't look like you're up to it.

Not me. There is another.

Yeah? Who?

There is much you would learn from me, Tau'ri. [breathes heavily] But for that knowledge there is a price.

A new host.

[raises his eyebrows] A host?

So that I may live. In exchange for all the knowledge of the Goa'uld. The secrets of star travel, our weapons, our power.

All that…

In time, more.

[leans down] Go to hell.

A single human life is worth so much you would risk a world?

That's right. That's why they call us the good guys.

Doc, let me know when he dies.