 Acharya Narendra Bhooshan's commentaries on all major Upanishads are proof of his profound knowledge in that sphere.These commentaries are in Malayalam.His interpretation (in Malayalam) of 10 major Upanishads are compiled as Dashopanishad Shruthipriya Bhasha Bhayam He has also done Lokamanya Tilak's "Geetha Rahasyam" Justice Ganga prasad's Origin of Religions "Mathangalute Uthbhavakatha", Swamy Sathyapathi Parivrajaka's "Yogameemamsa" into Malayalam.