Mahayana buddhist do not believe in a 'fixed karma' (定业), i.e.
karma that does not change. There are countless of repentence sutra
and dharani (mantra) devoted to changing one person's life through
changing one's karma and extinguishing bad karma (灭定业).The buddha
has realized that one's destiny and suffering can be relieved
through changing one's own karma (action). By changing your karmic
action, your fortune or life can be changed towards happiness.
That's why most buddhist temples in Singapore has countless of
repentence dharma service devoted to relieve the sufferings of
many, effectively to change the karma through repentence, vows (and
a variation in cause and effect).
Take for instance, a person is supposed to live for 30 years
according to his own 'fixed karma'. However, if he continue to save
lives and engage in releasing life, he might be able to live for
another 20 years or more. This is changing one's destiny through
doing good.
Do not be naive to believe that karma cannot be changed. Bad
karma can be relieved through great repentence and doing good. I
myself have undergone great sufferings through my past bad karmic
action. But I've changed my karma through doing good, releasing
life and engage in many repentence dharma service. My sickness is
almost cured. My mind is full of less evil thoughts (it purifies my
mind). This is changing one's life destiny. The most powerful force
for change in my life is GREAT REPENTENCE for the evils I've done
in this life such as killing and sexual misconduct.
Buddhism talks about 戒定慧 (三学)- precepts, concentration, wisdom
(three learnings). The precepts are done to prevent further evils
from being carried out. I'm now practising precepts in my daily
life to prevent killing and to save life. After sometime, I will
practise concentration and wisdom (that is for learning
meditation).
lol. karma is karma, where got 'fixed' or its opposite
'unfixed'.
if you think your sufferings have decreased, how would u know
it's due to all your chanting or 'repentance' etc. again, it COULD
be due to your merits accrued in previous lifetimes(karma and its
effects). u're not a buddha so u won't know. so it's just
speculation to me.