This volume primarily focuses upon the Yogācāra-Vijñānavādin concepts of mind and its means of expression such as the various consciousnesses, the nature of the bījas, and the ālayavijñāna. From this basis, related topics such as the nature of light, the simile of a river with respect to the flow of a consciousness-stream, and the nāḍīs that convey prāṇas, are explored. This allows consideration of the attributes of time and certain chakras that exist below the diaphragm. The 'soul' concept then comes into view and its relation to śūnyatā is revealed.