The Effects
of Action (Kamma) is delayed as a Sown Seed!

The Blessed Buddha once explained:
Regarding the effects of actions, Ananda, as to the person here who
avoids
all killing of any living being, who avoids all stealing of what is not given,
who avoids any misconduct in sensual pleasures, who
avoids all
false speech,
divisive speech, aggressive speech, and all idle and empty gossip, who is neither
envious, nor jealous, is good-willed, and who
is of right view, yet who
at the
breakup of the body, after death,
is reborn in a state of deprivation, in a
dreadful
destination, in the painful purgatory, or even in the hells, then it is
because either
earlier - prior to this -
such one also did evil actions to be
felt as painful, or later - after this -
such one did evil actions to be felt as
pain, or at moment of death such one entered into,
and maintained wrong views!
Because of one or more of these, right
after death, such one is reborn in
a
bad state of deprivation, a dreadful destination, in the painful purgatory,
or
even in
the hells. But since such one also - here and now - has been one who
avoids all killing
of any
living being, who avoids taking anything what is not given,
who avoids all misconduct
in sensual pleasures, who
avoids all
false speech,
divisive speech, aggressive speech, and all
idle and empty
gossip, who is neither
envious, nor jealous, who is of good will, and who holds right
views, such one
will experience the pleasant results of
that good behaviour, either here and
now, or
in the next rebirth, or in some subsequent later existence...
Comments: Behaviour (kamma) is always mixed:
Sometimes good, sometimes bad!
The effects are therefore similarly mixed: Sometimes pleasure, sometimes
pain...
Good begets good and dilutes and delays evil. Evil begets evil and dilutes
and delays good!

Source:
The Moderate speeches of the Buddha: The great speech on Action. MN 136
http://store.pariyatti.org/Middle-Length-Discourses-of-the-Buddha_p_1543.html Full Text:
http://www.accesstoinsight.org/canon/sutta/majjhima/mn136.html
An illustration of the delayed, overlapping
and interfering result of mixed
kamma:

For details on the mechanics
of Kamma = Intentional Action see:
https://What-Buddha-Said.net/drops/II/Kamma_is_intention.htm
https://What-Buddha-Said.net/drops/IV/Intention_is_Kamma.htm
https://What-Buddha-Said.net/drops/Unintentional_Action.htm
https://What-Buddha-Said.net/drops/II/Buddha_on_Kamma.htm
https://What-Buddha-Said.net/drops/III/Kamma_and_Fruit.htm
https://What-Buddha-Said.net/drops/III/Kamma_is_improvable.htm
https://What-Buddha-Said.net/drops/III/Inevitable_Consequences.htm
https://What-Buddha-Said.net/drops/II/Good_Action_dilutes_Evil_Kamma.htm
https://What-Buddha-Said.net/drops/II/Kamma_leading_to_short_vs_long_life.htm
https://What-Buddha-Said.net/drops/II/Kamma_leading_to_Health_vs_Sickness.htm
https://What-Buddha-Said.net/drops/II/Kamma_leading_to_Low_or_High_Birth.htm
https://What-Buddha-Said.net/drops/II/Kamma_leading_to_Wealth_or_Poverty.htm
https://What-Buddha-Said.net/drops/II/Kamma_leading_to_Beauty_vs_Ugliness.htm
https://What-Buddha-Said.net/drops/II/Effect_of_Action_is_Delayed.htm
https://What-Buddha-Said.net/drops/II/Kamma_leading_to_Power_or_Disrespect.htm
https://What-Buddha-Said.net/drops/II/Evil_Kamma_enhances_other_Evil_Kamma.htm
https://What-Buddha-Said.net/drops/II/Good_Action_enhances_other_Good_Kamma.htm
https://What-Buddha-Said.net/drops/II/Kamma_leading_to_Stupidity_or_Intelligence.htm