In Sanatan Dharma, preaching is known as "Upadesa" and it plays an important role in spreading the knowledge and teachings of the religion. The concept of preaching is closely associated with the guru-disciple relationship, where the guru imparts spiritual knowledge and guidance to the disciple.

According to Sanatan Dharma, the goal of preaching is not just to impart knowledge but also to help people develop a deeper understanding of the spiritual teachings of the religion and apply them in their daily lives. The ultimate goal of preaching is to help people attain spiritual liberation or Moksha.

Preaching in Sanatan Dharma is not limited to just the guru-disciple relationship. It also takes place through various forms of religious discourse, such as lectures, discussions, and debates. These discourses are usually held in temples, ashrams, and other spiritual centers and are designed to help people deepen their understanding of the teachings of Sanatan Dharma.

Another important aspect of preaching in Sanatan Dharma is the sharing of sacred texts, such as the Vedas, Upanishads, Bhagavad Gita, and Puranas. These texts contain profound knowledge and wisdom and are often studied and discussed in order to deepen one's understanding of the teachings of Sanatan Dharma.

Overall, preaching plays an important role in Sanatan Dharma, helping people to deepen their understanding of the religion and its teachings. It is an important means of transmitting knowledge and wisdom from one generation to the next, and is seen as a critical aspect of the spiritual journey towards enlightenment.