Along the knowledge that there are multiple dimensions, they also worked out ways and means to touch and reach out to these dimensions.
As the yogi meditates and his levels of consciousness rises from the gross to the subtle, touching each centre in his spinal cord, which are known as Chakras, his consciousness ascends from the consciousness of mundane things to higher and higher levels until it finally reaches the level of the multi-dimensional Supreme Reality—which is the essence of all life, the origin of everything in this world and the other.
Vedanta believes in different levels of existence. The different lokas or different planes of physical as well as different planes of thought—the bhu loka, bhuvah loka, swarga loka, jana loka, tapa loka. These are descriptions of different levels of existence and the yogi, through deep meditation, ascends them one by one until he reaches the highest dimension of thought and then transcends thought itself and reaches that which is beyond thought.
In the process, he learns to control laws, which are ordinarily not known to human beings and, therefore, the yogi performs something, using the different laws that the ordinary human beings do not know about. Those who do not know the laws, consider the objective reality, upon which the yogi works and brings about a change, as a miracle.
There are no miracles. What we call miracles, are the operation of laws that are unknown to the ordinary human being who has not expanded his dimensions and still thinks that the physical is the only dimension that is accessible.
All the yogic powers, the siddhi’s—reading thought, going beyond the mind, clairvoyance, seeing the things which are normally not seen, being able to move in the different planes of existence in one subtle body called the sukshma sharira—all these are actually practical things, practical achievements of a yogi who has learnt to explore the different dimensions and is going towards newer and newer dimensions.