Avatar: The Last Airbender, Season 2

Aang:
This is the last chakra, isn't it?

Guru Pathik:
Yes. Once you open this chakra, you will be able to go in and out of the Avatar State at will. And when you are in the Avatar State, you will have complete control and awareness of all your actions.

Aang:
Let's do this!

Guru Pathik:
The Thought Chakra is located at the crown of the head. It deals with pure cosmic energy, and is blocked by earthly attachment. Meditate on what attaches you to this world.

[Aang imagines various images and memories of Katara]

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

Aang:
[snaps out of his meditation] What? Why would I let go of Katara? 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:
[outraged] 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.