Anthroposophy and Knowledge of the Spirit

I would first like to characterize what is called the ancient yoga system of knowledge, which was once sacred in the Orient but has now degenerated. The yoga system of knowledge leads, I would say, to its kind of erudition, to its kind of knowledge of another world. What were the essential elements of this yoga system? I would like to mention the characteristic that is questionable today when it is practiced – at the time it was not questionable, but the way it is practiced today is questionable – because it is no longer appropriate for today's human nature, because human nature has changed since the times when the yoga practice was performed. What could be done in ancient times without harming human nature, and was done in ancient times, say, by the Indians, cannot be done today, especially by Westerners, without harming their body and mind. But let us agree on this. The essential and purely essential thing, among other things, in the practice of yoga is a modified breathing in addition to the ordinary everyday breathing of a person.