Aushadhagnis are the fires in herbs or the powers to heal. Such powers can by themselves manifest not simply as heat, but as astringent and bitter tastes which have more cleansing and healing energies themselves that reduce fever and infection. Others such as the Madhvagnis or sweet agnis manifest as sweet tastes that help promote vitality (ojas) and relate to the balagnis or the agnis of strength.
In order to have good strength of all bodily tissues and also of all the elements in their pure state, we have to keep these agnis or fires alive and well. Yet, we do not seek to do this as we do not consider this important today in our pursuit of a drug and artificial culture over a more organic culture which would be more conducive to our health.
Today's culture limits and suppresses our Agnis on all levels. The media culture and that of TVs, video games and even social media limits our attention span to the outside world and causes our agni mental agnis to decline. Others such as the chemical culture with reliance on pharmaceutical drugs suppresses our intellects and minds as also out digestive fires, hindering our ability to digest thoughts, emotions, feelings and also limits our metabolism. We clutter our minds and bodies with toxic impressions.
Ayurveda gives various qualities to all foodstuffs and their qualities upon the mind. Foods such as mushrooms for example are seen as being tamasic and dulling to the mind and also being harder to digest, help put out our jatharagnis, our digestive fires also, causing Ama or toxins in the body as a result, which breed disease when relocating in the body. This ancient and subtle science of keeping track of not just what we eat, but how we are eating has destroyed our digestive fires as a race over the past few centuries as Ayurveda has declined and as we consume our food without regard to our individuality and bodies. There is often a generic or "one size fits all" regime, whether it be raw and vegan foods on one size and generic diets based on allopathy on the other. No consideration is given as to our digestive fire or capacity for digestion (aharashakti) and as per how such foods and how we consume them (raw, cooked, with what spices and oils etc.) will affect us individually, such as the doshic types refine in Ayurveda with individual levels of biological constitutions.
Ayurveda recognises that just as we all have different minds and personalities and features, so also our bodies cannot simply conform to one simple diet alone. The effects of foods also changed when cooked or uncooked or when spices are added. For this reason, Indian cooking has always uses spices such as turmeric, black pepper, cumin, cardamom, ajawain, garlic, onions etc. along with oils such as sesame, mustard and ghee (clarified butter) in cooking in order to keep our digestive fires healthy and awakened. This is in sharp contrast to Western diets, which eat heavy meats and vegetables with little or no spices for digestion and in cooler climates, which Ayurveda considers environments for creating ama or toxins in addition to this.
Our Pranagni or the fire of Prana or breath that we take in is also largely toxic today. We breath in oxygen that is mixed with so many foul smells and also carbon monoxide which is in itself unhealthy on so many levels. In ancient times, Yogis and Kings used to perform large-scale Havanas or fire sacrifices by offering fragrant substances and clarified butter into the fire, by which purified the atmosphere and also the air we breath. They were cautious about breathing in toxins in the air and keeping the Pranagni, the fire of breath alive of which wards off airborne bacteria and parasites and hence such fire sacrifices were performed for this reason, as also to ward off foul smells created in day to day life by humans and animals alike. Today, there is no true consideration given to restoring this fire, although groups protests against pollution, but have no real answer to curing it, such as the ancient fire ceremonies of the ancient world, performed for these reasons.
Agni in the Rig Veda is also associated with the Rudras, the fiery deities and forms of the god Shiva, who represent the ten Pranas within us in Yoga and Ayurveda in the body of which there are five main pranas or breath and five lesser. The eleventh is the Atman or Self, which we have already noted as Chidagni or the fire of consciousness.
The Agni of the Pranas then is very important and requires that we keep these alive, especially with regards to Ayurveda and the five main forms of Prana in the body and their various functions:
Prana-Vayu – Rules Nutrients for body and mind (Mind, Head)
Udana-Vayu –Rules Exhalation and speech (Neck, Head)
Vyana-Vayu – Rules Flow of blood / Circulation (Chest, Arms, Hands)
Samana-Vayu – Rules Inhalation and digestion (Stomach)
Apana-Vayu – Rules Discharge of ama (toxins) (Legs, Sexual organs)
Each of these agnis of these pranas are important and relate to the five subdoshas of pitta (bile) and also kapha (phlegm) in the body also.
If our agni of our samanavayu is low for example, then our digestion will be sluggish and low (manda) or variable (vishama), as also if the agni of our apanavayu is likewise too high, we can suffer from loose stool and dysentery etc.
Our Vyanavayu which relates to the flow and circulation is blood is also important, as a low agni here manifests in poor circulation and also poor breath or prana throughout the body, which may be low or toxic, as in the flow of blood into the liver which, if toxic, creates liver and pitta (bilious) disorders.
In order to keep the Pranagni awaken individually along with these, practices such as Pranayama or breath-control was performed as in Yoga in order to throw out toxic air from our bodies and bring in fresh air; the retaining of air inside the body and also holding the breath when breathing out itself creates a heating-energy, of which also awakens our own fire of Prana or breath inside our bodies and helps us resistance against disease by consuming it or burning it up, just as a good metabolism or digestive fire does and as a good buddhagni or intellectual fire helps us burn up unwanted impressions of the mind, or ama or toxins in the mind.
The agni was kept alive in ancient times by burning diyas or ghee-lamps as well which psychologically helped awaken the mind and keep mental fires awakened as well as purified the home. In addition, every home in Vedic times in India performed the Agni Hotra or fire offerings twice daily also as also on public occasions where these were held to celebrate festivals such as Deepawali etc.
In the epic Ramayana, when the great hero Sri Rama returns after his conquest over Ravana of Sri Lanka, his pathway is lit by thousands of diyas or ghee-lamps, representing light over darkness. Sri Rama's wife, Sita Devi is also tested as to her chastity whilst in the captivity of Ravana by walking through Agni or fire, of which she remained unburnt and untouched, showing her purity. In ancient times it was believed that only those with papa or sin were burnt by the fire, indicating how Agni or fire is the enemy of demonic people or tamas - spiritual darkness and ama, toxins. Today, our society is greatly toxic and tamasic or dark and ignorant on all levels, and we are breeding a new kind of unconscious humanity as already mentioned, through smothering the agni out.
As an example, calculators have replaced the buddhagni or intellectual fire by reliance on them as opposed to physical mathematical skills which are waning in our youth. Yet even today these are waning physically, as our ancient Indian mathematicians as Astronomers and Astrologers who developed this science did their arithmetic in their heads, faster than what modern calculators can. This again is as they had strong powers of agni in the mind keeping it alert, awake and sharp. This is also how their smaranagnis, their agnis or fires of memory were sharp and high and could memorise the entire Vedic texts with correct pronunciation and metres of the mantras in the Vedic Sanskrit and their translations for for many thousands of years.
According to Yoga, the writing down of things as in books etc. is a lesser state of evolution as opposed to oral traditions and the culture of the mind, where these are retained and can be accessed at any time and are not subject to destruction by time, fires, floods and other natural disasters. This is how the Vedic wisdom was preserved for so many thousands of years unlike other more materialistic cultures, due to the Yogic teachings of awakening the agnis of the mind and keeping them alive so as the jnanagnis, the fires of wisdom would remain alive in the world and not die. Ancient Yogis and Brahmins were literally "walking encyclopaedias". The modern world has even now resorted to storing information electronically in computers and digital word and the physical book culture itself is declining, showing another devolutionary phase and another phase of deliberately killing our intellectual agnis.