Vesārajja: 'self-confidence' of a Buddha is fourfold. He is confident: 1. to have attained to a perfect Enlightenment of which it cannot be said that it omits anything essential to it; 2. to have destroyed all fermentations (Asava) leaving none that can be said to be undestroyed by him; 3. that what were declared by him as obstacles to liberation are undeniably such; 4. that his teaching fulfils its purpose of actually leading to final liberation from suffering. See A. IV, 8; VII, 58; M. 12.
Maha Thera Nyanatiloka. Manual of Buddhist Terms and Doctrines, Buddhist Publication Society, first edition 1952.