Only after taking up SannyAsa one gets the eligibility and right to receive the teaching of the mahAvAkyas that the Vedas proclaim in forms like "This Jiva itself is Brahman".
Brahman also means Veda.
Since the Vedas which are verily Brahman themselves declare Jiva as Brahman the mahAvAkyas get that exclusive spiritual power.
Just by knowing well that Jiva is brahman and by meditating on that will not make that goal a fact of experience. That declaration has to be repeated as a japa through the conglomerate of the letters of these veda-mantras and has to be meditated upon as a regimen; that is what makes the goal accessible.
‘Accessible’ does not mean ‘easily accessible’! I only said it in a comparative sense.