BY SERVE A DEITY
Tulsi-devi is the personification of selfless devotion. She is such a pure incarnation of devotion that whoever offers a puja to the Lord without offering a leaf of Tulsi, the puja is considered to be incomplete, since the leaf of Tulsi-devi is the representation of bhakti itself. That’s why learning about Tulsi-devi will help you understand the importance of Her for those on the path of bhakti.
For all those that want to excel in their devotion to the Lord, to know about Tulsi-devi is a great aid in attaining the mercy and the Lord Himself.