Initially, prajna is attained at a conceptual level by means of listening to sermons (dharma talks), reading, studying, and sometimes reciting Buddhist texts and engaging in discourse. Once the conceptual understanding is attained, it is applied to daily life so that each Buddhist can verify the truth of the Buddha's teaching at a practical level. Notably, one could in theory attain Nirvana at any point of practice, whether deep in meditation, listening to a sermon, conducting the business of one's daily life, or any other activity.
Initially prajna is attained at a conceptual level by means of listening to what?
sermons

The history of Indian Buddhism may be divided into five periods: Early Buddhism (occasionally called Pre-sectarian Buddhism), Nikaya Buddhism or Sectarian Buddhism: The period of the Early Buddhist schools, Early Mahayana Buddhism, Later Mahayana Buddhism, and Esoteric Buddhism (also called Vajrayana Buddhism).
What is the last period of Buddhism?
Esoteric Buddhism

During the Sangam period Tamil literateure flourished from the 3rd century BCE to the 4th century CE. During this period the 3 Tamil Dynasties Chera dynasty, Chola dynasty and the Pandyan Dynasty ruled parts of southern India. The Sangam literature deals with the history, politics, wars and culture of the Tamil people of this period. The scholars of the Sangam period rose from among the common people who sought the patronage of the Tamil Kings but who mainly wrote about the common people and their concerns. Unlike Sanskrit writers who were mostly Brahmins, Sangam writers came from diverse classes and social backgrounds and were mostly non-Brahmins. They belonged to different faiths and professions like farmers, artisans, merchants, monks, priests and even princes and quite few of them were even women.
In what part of India did the Tamil dynasties rule?
southern India