Therefore, Sariputra, it is because of his non-attainment that a Bodhisattva, through having relied on the Perfection of Wisdom, dwells without thought-coverings. In the absence of thought-coverings he has not been made to tremble, he has overcome what can upset, and in the end he attains to Nirvana.
All those who appear as Buddhas in the three periods of time fully awake to the utmost, right and perfect Enlightenment because they have relied on the Perfection of Wisdom. Therefore one should know the prajnaparamita as the great spell, the spell of great knowledge, the utmost spell, the unequalled spell, allayer of all suffering, in truth - for what could go wrong? By the prajnaparamita has this spell been delivered. It runs like this:
Gone, gone, gone beyond, gone altogether beyond, O what an awakening, all-hail!
Translation by Edward Conze, http://www.thebigview.com/buddhism