 Apart from his contributions in "Mother India", Sethna also occasionally published articles in other journals and wrote more than fifty books on Sri Aurobindo, the Mother, integral Yoga, poetry, science, philosophy, ancient Indian history and other subjects.His great sense of humour came out in his title "Light and Laughter".Sethna was born a Parsi-Zoroastrian, but discontinued its practice after becoming a disciple of Sri Aurobindo.