The term “sādhanā” means spiritual exertion towards an intended goal. A person undertaking such a practice is known as a sadhu or a sadhaka. The goal of sādhanā is to attain some level of spiritual realization, which can be either enlightenment, pure love of God (prema), liberation (moksha) from the cycle of birth and death (Samsara), or a particular goal such as the blessings of a deity as in the Bhakti traditions.IT’S ALL ABOUT LOVE
Sādhanā can involve meditation, chanting of mantra (sometimes with the help of a japa mala), puja to a deity, yajna, and in very rare cases mortification of the flesh or tantric practices such as performing one’s particular sādhanā within a cremation ground.
Anthony de Mello, an Indian orphan who became a Jesuit priest and founder of the Sadhana Institute in Pune, India, wrote a book of Christian meditations with the title Sadhana: A way to God.
Traditionally in some Hindu and Buddhist traditions in order to embark on a specific path of sādhanā, firstly a guru may be required to give the necessary instructions. This approach is typified by some Tantric traditions, in which initiation by a guru is sometimes identified as a specific stage of sādhanā. On the other hand, individual renunciates may develop their own spiritual practice without participating in organized groups.