If you focus on what is Mind Only, eg. Mind Unborn, no one can teach you anything of value outside the complete preview of this Mind.
Thus, your ability to awaken into the true reality of this Mind, which is perfectly unborn, is determined by the undivided power [bodhi] of your focus [Samadhi] on its pure self-nature [svabhava].
When all conditions, arisen since time immemorial, for perfect awakening [into its true uncreated essence] are met, the smallest ripple in the changing continuum of samsara, although beyond your minds eye, will be sufficient to trigger the instant entrance into your own deathless body the Buddhas deemed as Nirvana and as such, beyond any reproach by the realms of Mara.