Sādhanā (साधना; ; ) is an ego-transcending spiritual practice. It includes a variety of disciplines in Hindu, Buddhist and Jain traditions that are followed in order to achieve various spiritual or ritual objectives. Sadhana is done for attaining detachment from worldly things, which can be a goal of a Sadhu. Karma yoga, Bhakti yoga and Gnyan yoga can also be described as Sadhana, in that constant efforts to achieve maximum level of perfection in all streams in day-to-day life can be described as Sadhana. Sādhanā can also refer to a tantric liturgy or liturgical manual, that is, the instructions to carry out a certain practice. The historian N. Bhattacharyya provides a working definition of the benefits of sādhanā as follows: [R]eligious sādhanā, which both prevents an excess of worldliness and molds the mind and disposition (bhāva) into a form which develops the knowledge of dispassion and non-attachment. Sādhanā is a means whereby bondage becomes liberation. B. K. S. Iyengar (1993: p. 22), in his English translation of and commentary to the Yoga Sutras of Patanjali, defines sādhanā in relation to abhyāsa and kriyā: Sādhanā is a discipline undertaken in the pursuit of a goal. Abhyāsa is repeated practice performed with observation and reflection. Kriyā, or action, also implies perfect execution with study and investigation. Therefore, sādhanā, abhyāsa, and kriyā all mean one and the same thing. A sādhaka, or practitioner, is one who skillfully applies...mind and intelligence in practice towards a spiritual goal. The term sādhanā means "methodical discipline to attain desired knowledge or goal". Sadhana is also done for attaining detachment from worldly things, which can be a goal in itself. A person undertaking such a practice is known in Sanskrit as a sādhu (female sādhvi), sādhaka (female sādhakā) or yogi (Tibetan pawo; feminine yogini or dakini, Tibetan khandroma). 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 (saṃsāra), or a particular goal such as the blessings of a deity as in the Bhakti traditions.