The mind is said to be twofold; pure and impure. The impure mind is driven by desire and volition; the pure mind is devoid of desire.
The mind alone is the cause of bondage and liberation to humans. Attached to objects, it leads to bondage; freed from objects, it leads to emancipation.
The mind should always be made devoid of objects by the seeker of liberation, since the liberation of the mind devoid of objects is desirable.
When the mind, freed from contact with objects and confined in the heart, reaches nonbeing, then that is the
The mind should be checked until it meets with destruction in the heart. This is gnosis, this is meditation. The rest is diffuse speculation.
Amrita Bindu Upanishad (1-5)
Source: The Yoga Tradition; Its History, Literature, Philosophy and Practice by Georg Feuerstein, PhD