Gurudev, in the yajnas, the Rishis were invoked. What is the exact process? How come the people who existed so long ago still exist today?
You know consciousness never dies; the mind never dies! Nothing ever dies. It only changes form. Matter can neither be created nor destroyed. So is the same with energy.
In the consciousness, the Rishi energies are present.
It is like, you have all moods within you, and when you are acting in a movie or in a play, you create those moods. An actor creates different moods at different times. He shows anger, he shows fierceness, valor, or fear. So we can manifest all these emotions; we can act them out at any time.
The mind expresses its moods, though all the moods are within itself. At will it can express any of it at anytime. In the same way, in the higher consciousness, there are different impulses which indicate different abilities and qualities of consciousness. And they can be manifested by invoking.