He explained above that  there are 3 parts, the whole minded, the lesser ones,  and the entire population. in chapter 3, above, where he spoke  about the attribute of watchfulness, he spoke about the  3 observations and their various levels, one for someone whose spiritual level  is high and his outlook is deeper, another for the intermediates, and the third for the  general population, each person should start  according to his level, and slowly advance in rank. 