- Who then do I trust?
- You must trust yourself. Trust your own strengths.

Gandalf (Ian McKellen)

9 seconds sound clip from the The Lord of the Rings: The Fellowship of the Ring movie soundboard.

You can hear this line at 01:58:27 in the Blu-ray version of the movie.

Quote context

[...]

- Frodo, come and help an old man.

- How is your shoulder?

- Better than it was.

- And the Ring? You feel its power growing, don't you? I've felt it too. You must be careful now.

- Evil will be drawn to you from outside the Fellowship. And, I fear, from within.

- Who then do I trust?

- You must trust yourself. Trust your own strengths.

- What do you mean?

- There are many powers in this world for good or for evil. Some are greater than I am. And against some I have not yet been tested.

- The walls of Moria.

- Dwarf doors are invisible when closed. Their own masters cannot find them if their secrets are forgotten.

[...]