I'm looking for more information on the concept of שבעים כוחות האדם, which was apparently discussed by the Vilna Gaon. What are they? Where did he learn of them?
I've read that he writes about this in his commentary to Isaiah 11:1 - but the freely available editions of his commentary on Otzar don't have anything on that pasuk. (I don't have access to the Mosad HaRav Kook edition)
I also know of the Sefer called עצות והדרכות חלק א by רב ד"ר יעקב מרדכי גרינוואלד which includes a Kuntres at the end on this subject, but I don't have access to that either.
Any other relevant sources would be helpful. Thanks!