Yoga Sutra 1.18 samadhi follows on practice of the idea of stopping, and consists of samskaras alone

Sūtra I.18 The other (samādhi) follows on practice of the idea of stopping, and consists of saṃskāra-s alone The words follows on practice of the idea of stopping show the relation to the discipline, but consists of saṃskāra-s alone explains its nature. They both go with The other, which therefore follows on the practice, and consists of saṃskāra-s alone. It is the seed-less ultra-cognitive samādhi, which is other than the cognitive samādhi which has just been defined in the previous sūtra. When all the mental processes have stopped and only saṃskāra-s remain, the samādhi of the mind thus inhibited is ultra-cognitive. The means to it is the higher detachment. No meditation on an object can be a means to it, so the meditation is made on the idea of stopping, which is absence of anything. It is void of any object. The practice of this finally leads to a state …

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