Thank you for the observation. I understand that "roku" means six and that "ryoku" means power, however the statement was a quote made by sensei Gozo Shioda, the founder of the Yoshinkan style of Aikido. The quote was found on the Chudokan Aikido dojo website located at http://www.mnsi.net/~chudo/
Please excuse this post for not focusing on the original question, my desire was to explain why I quoted what I read, not what I understood. Again, thank you for the observation.