(SOURCE) – In the Profound Secret Letters of the Four Stages of Yoga it says:
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.
Excerpts from ( 120-168 )
One’s mind should be like vajra,
Able to penetrate all dharmas.
One’s mind should also be like a mountain,
Remaining unmoved in any circumstance.
Delight in world-transcending discourse
And do not take pleasure in worldly words.
Personally adopt all manner of meritorious qualities.
One should then influence others to adopt them as well.
Cultivate the five bases of liberation.
Cultivate the ten reflections on impurity.
The eight realizations of great men
Should also be the focus of analytic contemplation and cultivation.
The heavenly ear, the heavenly eye,
The bases of spiritual powers, the cognition of others’ thoughts,
And the cognition of past lives and abodes—
One should cultivate purification of these five spiritual abilities.
The four bases of spiritual powers comprise their root.
They are zeal, vigor, mental focus, and contemplative reflection.
The four immeasurables govern them.
They are kindness, compassion, sympathetic joy, and equanimity.
The four elements are like poisonous serpents.
The six sense faculties are like an empty village.
The five aggregates are like assassins.
One should contemplate them in this way.