My master Yoshi's first rule was possess the right thinking. Only then can one receive the gifts of strength, knowledge and peace.

Splinter (Kevin Clash)

19 seconds sound clip from the Teenage Mutant Ninja Turtles (1990) movie soundboard.

You can hear this line at 00:15:03 in the Blu-ray version of the movie.

Quote context

[...]

- Come back here. I'm not finished with you.

- Damn! (2)

- Raphael. Come sit by me.

- Couldn't this wait till morning?

- You will listen now.

- My master Yoshi's first rule was possess the right thinking. Only then can one receive the gifts of strength, knowledge and peace.

- I have tried to channel your anger, but more remains. Anger clouds the mind. Turned inward, it is an unconquerable enemy.

- You are unique among your brothers for you choose to face this enemy alone. But as you face it, do not forget them. And do not forget me.

- I am here, my son.

- Come on, April, you could've called me last night, you know?

[...]