But how can you be so sure?

4 seconds sound clip from the Rudolph's Shiny New Year movie soundboard.

You can hear this line at 00:37:38 in the Blu-ray version of the movie.

Quote context

[...]

- And Rudolph's red nose lit up that fog and rainy night like a magic beacon, in an ocean of gloom and despair.

- We'll rescue him in time, yes? No? No.

- It looks bad for Happy.

- Aye, aye. 'Tis... 'tis. Hopeless!

- Aw, come on. Nothing is ever hopeless. We'll find Happy.

- But how can you be so sure?

- Heck, I got you this far, didn't I?

- Have a little faith in me, and day by day I'll make your dreams all come true.

- Have a little faith in me, and, as they say, faith can move mountains for you.

- I'll lend a helping hand when things go wrong and by your side I'll stand as I help along.

[...]