(SOURCE) – In the Profound Secret Letters of the Four Stages of Yoga it goes like:
The sport of lions is the samadhi of unwavering single pointedness, which is the quintessence of the clarity of consciousness and awakens one to the self-cognizing wisdom within. Second, the samadhi that is the simplicity of the great natural state dispels illusion. The arising of this inconceivable samadhi is an indication of having obtained the power of the stage of heat. Third, by the samadhi of one taste, the ten bodhisattva stages are achieved and one courageously liberates all beings. As a child of the Victorious Ones of the three times one benefits others. Having achieved this pinnacle, qualities constantly increase. Fourth, by exerting oneself in the vajra-like samadhi one implements the stage of non-meditation. With the non-conceptual primordial wisdom of a Buddha one sees the exalted realms of the buddha fields. One obtains the unsought, but spontaneously present, supreme qualities, the great sphere. So it is said.