Iti imāsu paṭipadāabhiññāsu yo puggalo dukkhāya paṭipadāya dandhāya ca abhiññāya samādhiṃ pāpuṇāti, tassa so samādhi dukkhāpaṭipado dandhābhiññoti vuccati. Esa nayo sesattayepīti evaṃ dukkhāpaṭipadādandhābhiññādivasena catubbidho.
Ñ(III,19): So as regards this progress and this direct-knowledge, when a person reaches concentration with difficult progress and sluggish direct-knowledge, his concentration is called concentration of difficult progress and sluggish direct-knowledge. Similarly in the cases of the remaining three.
So it is of four kinds as of difficult progress and sluggish direct-knowledge, and so on.