Principally, we persuaded you to think that Rowan Morrison was being held as a sacrifice because our crops failed last year.

10 seconds sound clip from the The Wicker Man (1973) movie soundboard.

You can hear this line at 01:19:13 in the Blu-ray version of the movie.

Quote context

[...]

(Seagulls and waves)

- Welcome, fool. You have come of your own free will to the appointed place.

- The game's over.

- Game? What game?

- The game of the hunted leading the hunter.

- You came here to find Rowan Morrison, but it is we who have found you and brought you here, and controlled your every thought and action since you arrived.

- Principally, we persuaded you to think that Rowan Morrison was being held as a sacrifice because our crops failed last year.

- I know your crops failed. I saw the harvest photograph.

- Oh, yes. They failed, all right. Disastrously so. For the first time since my grandfather came here.

- The blossom came, but the fruit withered and died on the bough.

- That must not happen again this year.

[...]