Patanjali Yoga Sutra Transcribed from Parisamvad at The Yoga Institute.Chapter 2, Sutra 24Patanjali Yoga Sutra 2.24Tasya Hetuh AvidyaTasya: of that Hetuh: the cause, reason Avidya: ignoranceIgnorance Is The Cause Of This InjunctionListen to the audio:Check this out on ChirbitDr. Jayadeva Yogendra:

"The cause if suffering is Avidhya - Ignorance. We are ignorant. We don't know and as a result we make mistakes. That is the cause. So as a correction, we should be knowing that. But we don't do that. We take it that we're clever and we go on. A wise person understands and then says, "Correct, I'm unable to understand and he has accepted. This is a point worth remembering. When we see any ordinary conversation, you will keep on bothering and go on making mistakes. That is a point worth considering.

This is a point that is very important because all problems in life are a result of this. Do consider."