To control the various propensities of human mind there are various glands and sub-glands which form certain nerve centers inside the spinal column. They are called plexii in Tantra. Each and every plexus regulates a certain number of propensities. The hormones secreted from these particular glands influence the concerning sub-glands, the other lower glands, and the vrttis controlled by their respective glands.

The food and drink we take every day is converted into rasa (fluid), rakta, flesh, fat, bone marrow and lymph etc. Ultimately the lymph is converted into hormones of various types. The special hormone secreted from the spiritual aspirant’s pineal gland flows into the pituitary plexus. At that time if one’s mind remains engaged in pure spiritual thoughts that hormone flows from the pineal gland down the left side to the pituitary gland, and then to other plexii, glands and sub-glands, nerve fibres, nerve cells, veins and arteries, etc. This excessive flow of pineal hormone revitalises all the lower plexii. On the other hand, if one’s mind remain preoccupied with crude thoughts then the pineal hormone gets burnt up at the pituitary plexus. The lower plexii and glands, due to the lack of supply of pineal secretion, do not enjoy any spiritual bliss. But when the pineal hormone flows through the pituitary plexus to the lowest plexii, the undeveloped plexii of the body become healthier and revitalized. As a rule the upper chakras control the lower ones. So the svadhistána chakra controls the múládhára chakra, the manipura chakra controls the svadhistána and múladhára chakras, the anáhata controls the mańipura, svadhistána and muladhára chakras, and the ájiṋá controls all the lower cakras.

At the time of pineal secretion if a sádhaka goes into samádhi – he or she visualises or experiences a kind of divine aura around the anáhata chakra. The sádhaka realizes that he or she is experiencing a divine dip in the holy aura, and feels indescribable bliss in the heart. In that exalted state of realization every object of this universe seems to be extremely sweet, and one derives immense bliss which no worldly object could ever provide. The sun’s rays, the moon beams, the land, the water, in fact everything appears to be emanating continuous stream of blissful nectar.

Idaḿ mánusaḿsarveśáḿ bhútánáḿ
Madhvasyá mánúśasya sarváni bhútáni madhuh
Ayámátmá sarveśám bhútánáḿ madhvasya átmanah
Sarvani bhútáni madhuh.

Even a sworn enemy appears to be very sweet at that time. Everything is sweet. In Vaesnava philosophy this stage of samádhi is called madhura bháva. In Tantra it is called anindyánanda rasa samádhi.

Characteristics of Anindyánanda Rasa Samádhi

The different plexii of the body get revitalized due to abundant hormone secretion and become more active than before. The sádhaka enjoys immense bliss. Due to excessive feelings of joy the nerve cells and the nerve fibres become ineffective. A very sweet relation of love between the devotee and Parama Puruśa is established. Throughout the blissful experience a sweet taste is felt. This state is one of the thirty-two prominent states of bliss experienced by highly developed sádhakas. The special characteristics of this samádhi is that it cannot be attained by one’s own personal efforts, but only through the grace of the Guru.

Of course, to attain supreme spiritual salvation it is not necessary for a sádhaka to experience any samádhi at all. For example, a passengers travelling on a Calcutta-bound train may or will not be able to see the sights of Jamalpur or Bhagalpur towns if the doors and window-shutters are closed. Although the passengers are unaware of the towns they are passing through, they still reach their destinations. In the spiritual world also, the sádhaka, while ideating on the Supreme will certainly pass through the different stages of realization without necessarily being aware of it. When the all-merciful Táraka Brahma physically comes to Earth in the form of a Sadguru He helps the deserving sádhakas to attain this type of samádhi. Even when He is physically absent in this world He helps the deserving persons to attain this samádhi through other gurus.