Avatar: The Last Airbender, Book 2: Earth

Guru Pathik:
Now, let all of those attachments go. Let them flow down the river, forgotten.

Aang:
(snapping out of his meditation) What? Why would I let go of Katara? I...I-I love her!

Guru Pathik:
Learn to let her go, or you cannot let the pure cosmic energy flow in from the universe.

Aang:
Why would I choose cosmic energy over Katara? How could it be a bad thing that I feel an attachment to her? Three chakras ago, that was a good thing!

Guru Pathik:
You must learn to let go.

Aang:
I'm sorry, but I can't let go of Katara.

Guru Pathik:
Aang, to master the Avatar State, you must open all the chakras. Surrender yourself.

Aang:
Okay, I'll try.

Guru Pathik:
Now think of your attachments. And let them go. Let the pure cosmic energy flow.