Chanting mantras can be a rewarding and personal part of your practice. As you delve into the discovery of this aspect of yoga, you will find yourself drawn to specific mantras that you will want to share with your students.
Any change, in the normal behavior of the mind, can be an altered state. When we get angry, it is an altered state of consciousness; when we go to sleep, it is another altered state; and when we express ourselves, we create altered states. There are some experiences, which bring the mind down towards the gross, instinctive, and rational plane; and other experiences that go beyond the instinctive and rational level, which are probably best expressed by the term "intuitive states of mind."