Shri Shankara Acharya’s Vakyavritti Verse 40
‘When the identity of jiva and Brahman is firmly grasped by the intellect, then the erroneous conception that ‘Thou’ means anything other than Brahman will go for ever”.
For a long time the candidate to liberation will continue to think that theoretically he may be Brahman but practically he is subject to suffering, loss and so forth.
It is therefore necessary that the inner meaning of ’Thou’ and ‘That’ should be firmly established. Intellectual understanding is necessary, and for this an intellect set on sattva (light) is essential.
It is not like geometry which even a murderer can understand.
Empedocles was a greater philosopher than the Ionians because he postulated the necessity of a pure intellect devoted to divine contemplation for an understanding of the nature of the Self.
Charity, tolerance, cheerfulness, endurance and non-egoity must be practised along with attempts to understand the nature of the Self intellectually.