Discourse by Rev. Swami Bhajanananda Saraswati on bhūmi-śuddhi (purification of the earth) and āsana-sthāpana (establishing the seat), given at Kali Mandir Ramakrishna Ashram on 12 May 2018. This is part of a series of class-talks on the theory and practice of Kali Puja, the ritualistic worship of the Divine Mother Kali.