Causes of failure in sadhana- Overeating, exertion, talkativeness, adhering to rules, company of common people and wavering mind
Atyaharah prayasascha prajalpo niyamaghrahah/
janasangascha laulyam cha shadbhiryogo vinasyati//(Chapter -1, Verse -15).
Overeating, exerting physically & mentaly, talking too much, adhering to rules, being in the company of common people and unstable mind are the six (causes) which destroy yoga. (Chapter -1, Verse -15).