Nargarjuna states that,
"The tenth is the Cloud of Doctrine because
The rain of excellent doctrine falls,
The Bodhisattva is consecrated
With light by the Buddhas.
"They become established in the joy of the doctrine.
"They manifest in limitless forms for the benefit of others and transcend the ordinary laws of time and space. They are able to place entire world systems in a single pore, without diminishing them or increasing the size of the pore."
Taking the mystery out of this, one can declare that they can assume different psychological roles and behavior for the benefit of others and that they understand at a level deeper than intelligence the Avatamsaka idea that all is contained in a grain of sand and the all contains all grains.