The notion of enlightenment means “not bound”. Not bound to what? Not bound to one’s own mind in ordinary ways; not bound in confusion to all the suffering that one’s mind has produced and is experiencing. So the notion of enlightenment is not something outside of one’s own mind.
We cannot imagine achieving enlightenment, let alone perfecting any of the qualities of buddhahood, if we hold to ourselves as who we think we are right now — with the way we think and the validity that we give to our own mind and its existence – Dzigar Kongtrul Rinpoche