Because the mind is not able to distinguish between good and bad, the intelligence comes forward and puts itself ahead of the mind for the purpose of distinguishing good from bad. Even intelligence cannot by its own accord decide between the good and the bad but it is able to make a judgement of everything that is put before it.

Intelligence can be classified into four different categories. These are – the first is a selfish type, the second is a selfish selfless type, the third is purely selfless type and the fourth is based upon atma. (SSB 1976, p. 7)