Who said "You're sad because you've had no practice."?

This quote is attributed to Tweedledee and Tweedledum.

You're sad because you've had no practice. - Tweedledee and Tweedledum

"You're sad because you've had no practice."

Tweedledee and Tweedledum

Character in Through the Looking-Glass

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"We call it a Bread-and-Butterfly."

"If it was so, it might be; and if it were so, it would be; but as it isn't, it ain't. That's logic."

"Contrariwise, if it was so, it might be."

"We must have a bit of a fight, but I don't care about going on long."