Tririn-Three spiritual debts

Bhagavan - Shri Krishna graced the creator Lord Brahma with the knowledge of the Vedas. Then Lord Brahma created the brahmand.
Shri Krishna also apprised Lord Brahma that each jeev is born with three types of spiritual debts called tririn (Devanagari: त्रिऋण ISO15919: trir̥ṇa). Also, Lord Brahma was advised of the way to repay them.
In addition, jeev is born with prarabdh karma. These are the fruits of actions performed in past lives. One must endure these fruits in the present life. These actions were both good and bad actions. So, their fruits are also both good and bad.
According to the scriptures, by repaying the three debts we get acquitted from undergoing the fruits of many bad actions and agony caused by them. Even those who not believe in scriptures are also bound to suffer the agony brought upon by the sinful actions we performed in our past lives.
Repaying this debt is the way to avoid sufferings and agony. In order to repay these debts it is wise to first learn about then and then repay these debts.
Deva Rin

Deva Rin (Devanagari: देव ऋण ISO15919: deva r̥ṇa) is debt to the celestial gods and goddesses.
Our life is supported by essential forces like air, space, water, fire, and earth, food and many more. Who arranged for all of the above for us? From the moment of conception till our birth we were provided with everything needed for our survival. After birth we had no idea of what is required for our sustenance. Who made milk for in our mother's breast?
God graciously provided everything through many celestial gods and goddesses like Soorya Devata (Sun), Pawan Devata (Wind), Agni Devata (Fire), Varun Devata (Water), Saraswati Devi (goddess of knowledge), Dharati Mata (earth), Annapoorna Devi etc.
We are indebted to them for providing valuable gifts for sustenance of our life. That’s why our scriptures advise us to express our gratitude to the celestial beings (devi and devata) by offering fire sacrifices (yagya) to celestial beings (devi-devatas).
Following Scriptural advise of respectfully performing Vedic rituals to honor these sources benefits us and improves our surroundings. Additionally, it improves physical and mental health and bestows knowledge and wealth.
The following example explains this further. According to Vedas one should offer water to the rising sun. This action is called offering arghya (Devanagari: अर्घ्य ISO15919: arghya). Now to do so, one has to get up early in the morning (which is good for health), go to the river to bathe and fetch water (benefit of fresh water), standing while facing towards the sun (improves vision and with rays of early morning sun, human body can create Vitamin D which is also essential for health). We also get the benefit of fresh and clean morning air also.
So, by performing only one activity we get to avail the benefits from Varun Devata, Soorya Devata, earth and space.
Adding to the above example when proper yagya samagri (material consigned to the ceremonial fire) burns, the fumes permeate the atmosphere and purify the entire area. Everyone breathing that air benefits from inhaling that purified air. Thus, getting all the panch mahabhoot helps in maintaining our health and well being.
So, we must be grateful to the celestial beings for providing these essentials elements.
Rishi Rin

Human beings acquire the knowledge from the ancient sages and intellectuals as in Manu Smriti written by Manu. These scriptures teach about the ideal conduct and behavior to be followed during our lifetime.
Sage Ved Vyas wrote Gita and Mahabharat to impart the knowledge of trikarma and their consequences. He also wrote Vedant to enlighten us with the path of knowledge which leads to liberation from the influence of Maya.
Sage Ved Vyas also wrote Shrimad Bhagavata Mahapuran. Shukdev Paramhans recited the same to king Parikshit. Bhagavat bestows the knowledge of pure devotion to the seekers. Similarly there are numerous other scriptures written by countless other sages to enlighten us.
Thus humanity is indebted to many such sages and seers, who are the source of true knowledge which liberates people from the clutches of Maya. We are indebted to these sages who provide knowledge to mankind. This debt is called rishi rin (Devanagari: ऋषि ऋण ISO15919: r̥ṣi r̥ṇa).
To repay this debt we are expected to learn the scriptures, and impart the same knowledge to others as well. Brahmcharya ashram and sanyas ashram are dedicated for this purpose. Even though, before God realization, it's not possible for everyone to attain perfect knowledge of all the scriptures, yet an attempt to do so is expected.
Pittri Rin

Human beings have a chance to repay the debt to our ancestors in grihastha ashram by bearing children and nurturing them.
We are indebted to parents and ancestors, who bestowed lineage, a precious treasure of culture, traditions and sanskars. This debt is referred to as Pittri Rin (Devanagari: पितृ ऋण ISO15919: pitr̥ r̥ṇa).
We get the chance to repay this debt in grihastha ashram by giving birth to children, nurturing and educating them and teaching them valuable traditions of the ancestral lineage. For example, as Lord Ram followed the ideals of His ancestral lineage, Raghuvansh, by being loyal to His subjects and keeping His word at all cost.
Later, due to few changes in culture and traditions, the following two debts were added in some scriptures –
Nri Rin

Debt unto mankind can be paid off by mutual cooperation and benevolence
The Holy text, the Shatpath Brahman (1.7.2.1-6) has improvised the concept of debt unto mankind and applied this doctrine to the entire human race. Debt unto mankind is called Nri Rin (Devanagari: नृ ऋण ISO15919: nr̥ r̥ṇa) and can be repaid by mutual cooperation and benevolence.
Bhoot Rin

Bhoot Rin (Devanagari: भूत ऋण ISO15919: bhūta r̥ṇa ) is debt unto animals like cow and ox, various plants, and the panch mahabhoot. We are indebted to God, who provided all this for our survival. Repaying this debt includes being kind to animals and plant-life, making their life peaceful and abstaining from all activities that disrupt the ecological balance.
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