Francis Cardinal Arinze, until 2 days ago, Cardinal Prefect of the Congregation of Divine Worship and the Discipline of the Sacraments talks about kneeling while receiving Holy Communion. He's a very funny guy who comes up with stuff like:
"If you can find any document from Rome saying 'remove the altar rails', I will give you a turkey."
And this gem: "And those who want to receive on the tongue. You leave them in peace - and not in pieces."
I'll let the good Cardinal speak for himself.
40 minutes ago