"You must have heard about the Taoist concept of yin and yang, the concept of polar opposites into one reality. Reality exists through polar opposites – through the positive and the negative, through the male and the female, through yin and yang.

"Reality is a dialectical process. And when I say ‘dialectical process,’ I mean it is not a simple process, it is very complex. A simple process means one element working; a dialectical process means two polar opposites working in one direction. And though they appear as opposites, they create a symphony, they create a musical harmony. And that harmony is reality.

"Man and woman, they create humanity. Man alone is not humanity, neither is woman alone humanity. Human being – the music, the synthesis we call human being – is a dialectical phenomenon. Man and woman, they both work to create humanity, they both help to create humanity. And the way of their creating it is dialectical. They exist as polar opposites, and the inner tension between the two creates the energy for movement, for process, for further growth.

"It is the same on every plane. If we go deep down with the physicist to the atom’s structure, inner structure, then again we find two polar opposites working there: the negative electricity and the positive electricity. Because of these two polar opposites, matter is created. If there is only positive electricity, the world will disappear immediately. If there is only negative electricity, there will be nothing. But negative electricity and positive electricity create an inner tension, and because of that inner tension matter exists.

"It is the same in the inner being of man also. This sutra is concerned with that. We discussed how awareness creates an inner sun. Now this sutra talks about the creation of an inner moon. Sun is symbolic of the inner positivity and moon is symbolic of the inner negativity. Sun is the inner male and moon is the inner female. These words are symbolic, and for Indian yoga, particularly, they are very meaningful. So by sun is not meant the outer sun, nor by moon the outer moon. Those two words are used for the inner universe, sun and moon.

"Indian yoga divides man into two parts: the sun part and the moon part. Even one breath is known as the sun breath and another breath is known as the moon breath. And one of the deeper findings is that if you stop the moon breath, and just breathe through the breath that is known as the sun breath, your body will become hot. And such great heat can be created, simply by using only one kind of breath, that it seems inconceivable in physiological terms. In Tibet there exists a heat yoga which uses only the sun breath, not using the moon breath at all – because the breath is continuously changing.

"Western medical science has not yet taken note of it. Breathing is not a simple process; it is a dialectical process. You are changing your nostrils every hour, approximately every hour, forty minutes. Somewhere between forty and sixty minutes your nostril changes, you begin to take the breath from the other nostril; then again it changes. When you need more heat in the body – if you suddenly get angry – your sun breath starts. Yoga says that when you are angry, if you use your moon breath and stop the sun breath, you cannot be angry at all, because the moon breath creates a deep coolness inside.

"The whole body is also divided between sun and moon, and the mind is also divided between sun and moon. So don’t take man as one, because nothing can exist as one. Everything exists through duality. You are divided in two: you have a negative part and you have a positive part. The positive is known as sun in Indian symbology, and the negative as moon. The negative is cool, silent, still. The positive is hot, vibrant with energy, active. The sun is the active part in you and the moon the inactive part in you.

"And if the active and the inactive both come to a deep equilibrium, you are enlightened suddenly. If one is more emphatic, you have an imbalance; if both are of equal force they balance each other, they negate each other; and the moment both are of equal force, your inner balance is regained and you reach to a different reality – the reality of the nondual. That one, the nondual, can be felt only when both these dualities in you are balanced and you transcend them.

"In the world we exist as duality. Beyond the world we exist as nonduality, one. You can think of yourself as a triangle: two angles exist in the world and the third angle exists beyond the world. Two angles belong to this, this world, and one angle belongs to that, the world of the brahman. But if these two are in an imbalance, you cannot go beyond them. You go beyond them only when they regain balance.

"This balancing is nirvana, this balancing is moksha, this balancing is the centering. How does awareness work to balance this duality? And the moment this duality is balanced, you cannot be reborn again – you disappear from the world. You can be born again and again only if there is an imbalance. If the balance comes to totality, the balance becomes total, it is impossible to be born again. You disappear from the world. The body cannot exist then. Then you cannot re-enter a body again." Osho