Yoga Sutras of Patanjali translated by Yogi Kalinath - Chapter 2, Verse 19
Pada 2, Sutra 19
The phases of the primary constituent forces of Nature are the particularized, the unparticularised, the differentiate and the undifferentiated.
Here Rishi Patanjali analyzes the forces of Nature from the atomic (the unparticularized) to the visible (particularized), from the unmanifest (primary matter or Prakrti) to the primary manifestation. The cascading of the Universe into manifestation into that which is discernable and perceivable by the five senses.
Rishi Patanjali is a spiritual scientist, one who analyzes and systematizes hence his classification of Yoga into an eight-limb system.