I thought of it because they were part of the intro to Babylon 5's spin-off series Crusade. Although it's more correct to say that Crusade was the spin-off series to the Babylon 5 movie A Call To Arms.
Galen the techno mage was questioning the captain:
Quote:
Galen:
Who are you?
Gideon:
Captain Matthew Gideon.
Galen:
What do you want?
Gideon:
To find a cure for the Drakh plague before it wipes out all life on Earth.
Galen:
Where are you going?
Gideon:
Anywhere I have to.
Galen:
Who do you serve, and who do you trust?
[silence]
Galen:
Who do you serve, and who do you trust?
Gideon:
I don't know.
Galen:
Then I will go with you.
That's where I got them from, I just assumed you too had watched the series and would catch the reference.