First hand answer

HeShang's (Venerable Haiyun Jimeng) classification:

The Enlightened: The one who is able to describe the references or experience first hand.

The ideologist: one who researches on the first hand references and converts it into second hand resources.

The philosopher: one who researches on the second hand references and converts it into third hand resources.

The scholar: one who researches on the third hand references and converts it into forth hand resources.

The specialist or craftsman: one who researches on the forth hand references and converts it into fifth hand resources.

See how HeShang has his own first hand answer to most of the things...