Many people know about the Advaita Vedanta teachings on the five koshas, sheaths or bodies covering our atman, or highest core self. However, people do not know how to strip off or negate each of the lower koshas to become liberated and attain "Advaita Siddhi," the highest stage of realization of the Self that thereby makes one an enlightened Paramahansa or saint. The pathway to nirvikalpa samadhi is certainly available in Hinduism but several non-denominational principles from other spiritual traditions fill in missing details to make its teachings more coherent.
The fact is that you potentially have four higher spiritual bodies of transcendental attainment that are exactly the purified koshas, namely your subtle body (which leaves your physical body upon death), a Causal body, Supra-Causal body and then Immanence body or Superconsciousness body. Second, the spiritual path essentially entails progressively generating each higher body through various practices that refine the vital energy within your present body. You progressively differentiate the energy of your subtle body from a coarser mixture of internal energies so that it can emerge from your physical shell due to the thinning of its interface with your unpurified residues. The miraculous powers of the Hindu saints arise because they attain these bodies and use them in various ways rather than because they think about something and then it magically manifests. To attain these higher spiritual bodies that reside on heavenly planes you must cultivate an elevated mental life along with virtuous behavior and activities, and refine your Prana through special practices (i.e. worship, mantra, yoga, pranayama, etc.) that purify it to a high enough degree to differentiate it from your body's ocean of coarser vitality. Then the first of these bodies can finally escape from your physical body of matter.
In this book are the most effect forms of bhakti, japa mantrayana, kumbhaka pranayama, Sahasranama recitation, bhajans singing, solar and lunar energy absorption, Advaita Vedanta study, sadhu mental detachment practices, sexual yoga, and tantric yoga inner energy work to attain the spiritual bodies of transcendence that are the core of the Hindu teachings on spiritual liberation. If you unravel that tamas densification or congealing of higher energies within your physical body you will free your spiritual bodies one by one.