In the previous lecture, we briefly discussed the Five Wisdom or Dhyani Buddhas.
These five Buddhas represent the five qualities of the original Buddha nature that is in us and in the whole universe. That original Buddha-nature has been suppressed by our worldly cravings and bad karma.
So we can try to restore our original pure Buddha consciousness through rituals in which we worship and call on these five Buddhas.
These cosmic Buddhas and other Vajrayana deities can help us to purify ourselves until we become a bodhisattva.