Self realization-only through intellect.

The gross body
made up of the five gross elements
(earth, water, fire, air and ether)
is meant to reap the fruits of past actions in the shape of pleasure and pain.

The subtle body
consisting of the five airs, the mind,
intellect, the ten senses and
made up of subtle elements is also meant for enjoyment (as in dreams).

Inexpressible and beginningless ignorance is said to be the causal body
(as in deep sleep).
Know the Self to be other than these three upadhis.

Just as a clear crystal (itself colourless) appears red, blue, yellow, etc.,
according to the background,
so also the Self,
pure and untainted,
seems to be identical with the body,
the senses, the mind, intellect or blissful ignorance (panchakosas) when in contact with them.

Just as husking the paddy exposes the grain within (the rice),
so also should one judiciously separate the pure Atman from the sheaths covering it.

Though always and everywhere present, the Self does not shine forth in all places. Just as light is reflected only in a transparent medium, so also the Self is clearly seen in the intellect only.

The Self is realized in the intellect as the witness of the activities of,
and yet separate from the body, the senses,
the mind, intellect and gross nature (prakriti) as is a king in relation to his subjects.

🕉 Sri Adi Shankaracharya. 
✅ Atma Bodha. Verses 12-18.