vajrasattva mantra meaning

In Tibetan Buddhism, Vajrasattva is associated with the sambhogakāya and purification practice. Vajrasattva appears principally in two Buddhists texts: the Mahavairocana Sutra and the Vajrasekhara Sutra. In the Diamond Realm Mandala, Vajrasattva sits to the East near Akshobhya Buddha. where feet may fail meaning