In Yoga Sutra 2.52, Patanjali says:
TATAH KSIYATE PRAKASAVARANAM.
The regular practice of Pranayama reduces the obstacles that inhibit clear perception.
(English translation from The Heart of Yoga by T.K.V. Desikachar).
Our thoughts are actually only running back & forth between two things: the past & the future. It is like a monkey which never wants to sit still! Through the practice of Patanjali Yoga Breathing, we will be able to quiet our monkey minds & enjoy the present moment.
