Bhakti (devotion) in Sanatan Dharma is an essential element. There are 9 stages of Bhakti.
But even before you start, it is important to cleanse the organs and the senses with which you will practice. Just like utensils must be clean before making the food, tools of our body must be clean before practicing Bhakti. What are these tools ?
This article was found in sameedh.com
At the beginning of Bhagvad Gita, Nyas associates each organ with another mantra (verse) that is part of Chapter 2 in Gita. In Siddhi Lakshmi Stotra, Nyas at the beginning associates with different names of the Goddess.
Read the original article to know which are the organs along with the reasons why they must be pure, before commencing any prayer or pooja: https://www.sameedh.com/inspire/what-is-nyas-and-why-do-it
Our body is a temple. we do Nyas to purify our body and invite different Daivik shakti to reside there atleast through our intention so that we can perform sadhana towards Gods. And ascend from Manushatva to Devatva. from the level of humans to Demi-Gods. Spiritual upliftment by refining ourselves.