Maha Samadhi is the final conscious abandoning of physical body. To achieve Maha Samadhi all karma needs to be completely dissolved - requiring that that individual has at least achieved self realization or soul realization before being able to realize Maha Samadhi.
All - even smallest pieces of attachment or karma are surrendered to God and dissolved in divine love to merge with an ocean of love and be uplifted into worlds beyond karma or become one with God.
God is Love
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