Six Levels - Link

The Kuzari says that there are 5 levels of existence. צומח דומם חי מדבר ישראל - Vegatation, inanimate objects, living creatures, speaking beings and Jews.

I think there is a 6th category:

Rav Dovid Yitzchak Mann ztz"l.

He was beyond genius. Here is a sample shiur [we have many BS"D - שמעו ותחי נפשכם] on Parshas Shoftim, based on his די באר.