The best way to understand Kamma is to understand the Buddha's teaching.
Please read the book below from Chapter 15.
In regard to Niyama please read pge 262
Extract is given below:
The Five Niyāmas
According to Buddhism there are five orders or processes
(Niyāmas)12 which operate in the physical and mental realms.
1 Utu Niyāma, physical inorganic order; e.g., seasonal phenomena
of winds and rains, the unerring order of seasons,
characteristic seasonal changes and events, causes of winds
and rains, nature of heat, etc. belong to this group.
2 Bīja Niyāma, order of germs and seeds (physical organic
order); e.g., rice produced from rice seed, sugary taste from
sugar-cane or honey, and peculiar characteristics of certain
fruits. The scientific theory of cells and genes and the physical
similarity of twins may be ascribed to this order.
3 Kamma Niyāma, order of act and result; e.g., desirable
and undesirable acts produce corresponding good and bad
As surely as water seeks its own level, so does Kamma, given
opportunity, produce its inevitable result, – not in the form of
a reward or punishment but as an innate sequence. This sequence
of deed and effect is as natural and necessary as the
way of the sun and the moon, and is the retributive principle
Inherent in Kamma is also the continuative principle.
Manifold experiences, personal characteristics, accumulated
knowledge, and so forth are all indelibly recorded in the
palimpsest-like mind. All these experiences and characters
transmigrate from life to life. Through lapse of time they may
be forgotten as in the case of our experiences of our childhood.
infant prodigies and wonderful children, who speak in different
languages without receiving any instruction, are noteworthy
examples of the continuative principle of Kamma.
1 Dhamma Niyāma, order of the norm; e.g., the natural
phenomena occurring at the birth of a Bodhisatta in his last
birth. Gravitation and other similar laws of nature, the reason
for being good, etc. may be included in this group.
2 Citta Niyāma, order of mind or psychic law; e.g., processes
of consciousness, constituents of consciousness, power
of mind, including telepathy, telesthesia, retrocognition,
clair-voyance, clair-audience, thought-reading, and
such other psychic phenomena, which are inexplicable to modern
Every mental or physical phenomenon could be explained by
these all-embracing five orders or processes which are laws in
themselves. Kamma as such is only one of these five orders.
Like all other natural laws, they demand no lawgiver.
Of these five, the physical inorganic order, the physical organic
order and the order of the norm are more or less of the
mechanical type though they can be controlled to some extent
by human ingenuity and the power of mind. For example,
fire normally burns, and extreme cold freezes, but man has
walked unscathed over fire and meditated naked on Himalayan
snows; horticulturists have worked marvels with flowers
and fruits; and Yogis have performed levitation. Psychic law
is equally mechanical, but Buddhist training aims at control
of mind, which is possible by right understanding and skilful
volition. Kamma law operates quite automatically and, when
the Kamma is powerful, man cannot interfere with its inexorable
result though he may desire to do so; but here also right
understanding and skilful volition can accomplish much and
mould the future. Good Kamma, persisted in, can thwart the
reaping of bad.
Kamma is certainly an intricate law whose working is fully
comprehended only by a Buddha. The Buddhist aims at the
final destruction of all Kamma.
Kamma-Vipaka (fruit of action) is one of the four unthinkables
(acinteyya), states the Buddha in the Anguttara Nikāya.13
===========http://www.buddhanet.net/pdf_file/buddh ... gsurw6.pdf