Yoga exists in the world because everything is linked. - T.K.V. Desikachar

The breath relates directly to the mind and to our prāṇa, but we should not therefore imagine that as we inhale, prāṇa simply flows into us. This is not the case. Prāṇa enters the body in the moment when there is a positive change in the mind.

It is when obstacles do not seem to be present that it is most important to be on our guard. Nothing is more fraught with danger than to mistake a temporary state for a permanent one. We must expect cycles of clarity and confusion, recognizing that falls from clarity may be more disturbing than a state of no clarity at all. When obstacles appear, it is necessary to advance toward a state of reflection to reduce their impact and prevent them from taking over.

Changes of mind can be observed primarily in our relationships with other people. Relationships are the real test of whether we actually understand ourselves better.