According to Hathayoga Pradeepika, Janasanga (association with people) is one of the factors that can hinder the progress of yoga. This is because excessive social interaction and external distractions can lead to disturbances in focus, which is essential for achieving success in yoga practice.
- Dhairya (patience) is an important virtue for yoga practitioners and does not hinder progress.
- Tatwajnana (knowledge of the truth) is essential for the progress of yoga, not a hindrance.
- Sahasa (impatience or rashness) can be counterproductive, but the main hindrance mentioned in Hathayoga Pradeepika is Janasanga.
Thus, the correct answer is (4) Janasanga.