You see, when the mind houses two personalities, there's always a conflict, a battle.

8 seconds sound clip from the Psycho (1960) movie soundboard.

You can hear this line at 01:46:57 in the Blu-ray version of the movie.

Quote context

[...]

- A man who dresses in women's clothing in order to achieve a sexual change or satisfaction is a transvestite.

- But in Norman's case, he was simply doing everything possible to keep alive the illusion of his mother being alive.

- And when reality came too close, when danger or desire threatened that illusion, he'd dress up, even to a cheap wig he bought.

- He'd walk about the house, sit in her chair, speak in her voice. He tried to be his mother. And now he is.

- That's what I meant when I said I got the story from the mother.

- You see, when the mind houses two personalities, there's always a conflict, a battle.

- In Norman's case, the battle is over, and the dominant personality has won.

- And the 40000 dollars? Who got that?

- The swamp.

- These were crimes of passion, not profit.

- He feels a little chill. Can I bring him this blanket?

- Oh, sure.

- All right.

[...]