The Tatparya of Action (Karma Yoga): The essential message is that one must perform one's prescribed duties (dharma) with detachment, offering the results to the Divine, rather than seeking absolute cessation of all action (Sannyasa).
The Tatparya of the Soul (Atman): The conclusive meaning is that the soul is eternal, indestructible, and distinct from the perishable body. Therefore, one should not grieve over the death of the body.
The Tatparya of Devotion (Bhakti Yoga): The ultimate message is that surrendering completely to God (Lord Krishna) is the most effective and final path to peace and union with the Divine (Moksha).