Yoga Sutra 1.21 the yogis are of nine kinds
Sūtra I.21 For those who practise with ardent energy, it is near They soon attain samādhi and the fruit of samādhi. The yogin-s, who practise the four methods beginning with faith, are of nine kinds. As he explains, they are divided according to the methods which they follow, either mild or moderate or intense. Each…