The term teleology denotes action, its purpose and goodness while eschatology denotes the rebirth and the next incarnations. These two issues are dealt in the SS from the second sootram(verse) of the sivagnanabodham.
The term IRUVINAI-OPPU denotes the balance between the good deeds and the bad deeds. The concept of vinai(deeds) is common in most hindu system of schools. The deeds are divided into these good and bad on the ethical aspects of worldly existence.
A soul(man) indulges in the worldly pursuits in order to survive and propagate his species. These two are the fundamental biological functions of all living creatures. The survival depends on the feeding. The feeding comes from predation of other living creatures. The predation is essential for the physiological living. The reproduction needs another living organism through which the life is passed to another generation through ones DNA.
The DNA carries all the information of the individual, his family, ancestors, tribe, caste, creed and the entire evolutionary information of the life! The individuals thoughts,actions and behaviours are coded into his brain memory. The memory is processed and kept in the remote memory. The remote memory is taken by the RNA and taken to form fresh DNA codes. The codes are transmited to the children through the sperm or ovum.
The child therefore gets these ancestor's information involuntarily through this DNA transcription process. The child also gets the information of the parents and their deeds through the time of parenting through verbal informations and sensory process about the ancestors and they get into the child's behavior. This process is well documented by the learning theories and behavioural schools of PAVLOV,SKINNER and ARON BECK.
The persons deeds are hence from the ancestors and the place of growth. Besides the individual is capable of thinking himself and able to do things on self accepted morality. These stages are well observrd by LAWRENCE KOHLBERG in his theories on development of morality in the child as preconventional, conventional and self accepted moralities.
The vinai concepts is analogous to these psycho-developmental process. The good deeds and bad deeds are product of the genetic,environmental and conscious self actions. Thus the deeds are divided into three types: 1.oozh vinai=deeds of the ancestors 2.pirar vinai=deeds of the environment 3. than vinai=voluntary self actions
Thus the worldly existence bring us about to do all the three deeds voluntarily or involuntarily. The wrong deeds and the right deeds are adjudged by the sivam. When the balance are same the process of IRU-VINAI-OPPU happens.
It is a common question how we could be responsible for our ancestors wrongs? How we could be punished for this? Who is there to watch all this?
Let us take the example of people with anti-social personality disorders. These are the persons who have most of the features of the wickedness and evils we can think of in life. These antisocial personalities are the people who have highest incidence of suicide(15%). They also have 20-30% incidence of depression. Their off-springs are not spared. The famous study on these people's children was done in US in a town called St.LOUIS. the stydy reveled that the children of the antisocial personalities have higher proportion of psychiatric morbidity. The boys later go to develop ALCOHOL DEPENDENCE and the girls to develop HYSTRIONIC personality disorders. The triad of hysteria,alcoholism and anti-sociality is thus obvious. We now have proven data that ancestors deeds in the form of "oozh "can manifest on the children.
Thus one has the duty to cancel all his bad deeds and the environment and his ancestors by good deeds to get the iru-vinai-oppu. The rebirth phenomena in Hinduism can only mean the future generations or the off-springs of the individual. This evolutionism is hidden in many of the saivite works including the St.MANIKAVASAKAR. he says " from earliest forms like grass, tubers, worms, animals and then to man the person gets reborn. This process is tiresome and he wants to get rid of this."
This saivite eschatology is a pointer to the early evolutionism in saiva doctrines. Speculative thoughts have always considered evolutionism in the east and the west. The DASAVATHARAM is an another example. In the west ARISTOTLE.ST.THOMAS AQUINAS, DESCARTES, HEGEL, LAPLACEÂ…etc have mentioned it.
The paleo-biological researches of LAMARCK and CHARLESS DARWIN have proved this later.
>> A soul(man) indulges in the worldly pursuits in order to survive >> and propagate his species.
The soul does not propagate or pursuit, its the intellect (Buddhi) that propagates, intellect is the one which traps the actual soul into a matter - energy bonding. Intellect cannot exist without a soul. Soul can exist without an intellect.
Iruviniai Oppu is the basic balance as you pointed out, however there is no solution prescribed in the text below.
You have mentioned 3 vinai categories, the fourth is also there but that is the one that has many clues to finding the solution.
Today, the audience (Mainly younger gen) needs a solution. When St.Manikkavasagar wrote pullagi poondagi or Guru Arunagiri wrote Sinathil ethanai, the world was not as complicated as it is today. And today's youth have more information than the average commoner of yesteryears. Darwin, evolution etc is not a great topic, however survival is.
4th type of vinai is the effect of an involuntary action. If we analyze scientifically why the repercussions of this 4th type are not a trapped in one's buddhi and how this puts the soul free of an intellect bonding - the key to unlocking the iru vinai piravi can be unleashed.