Perseverance is one of the most important characteristic and trait to be followed in Yoga practice.
I have eloborated the concise Sutra on this on my post here on Medium.
Yogis Classified by Practice. Patanjali Yoga Sutras: 19 & 20
These below sutras mention the nature and characteristics of various types of Yogis.
The more detailed classification that we can make about perseverance the more we will be able to create systems around perseverance.
Following you and loving your posts,