Prior or later good
action enhances & prolongs effects of good Kamma!

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 taking what is not given, who avoids all & any misconduct in
sensual pleasures, who
avoids all
false speech, divisive speech, aggressive speech, and all
idle & empty
gossip, who is neither envious, nor jealous, who is of good will, who holds right
views, and who at the breakup of the body, right after death, is
reborn in a pleasurable and
happy destination, even in the divine dimensions: Either earlier -prior to this-
such one also
did
good actions to be felt as
pleasurable, or later -after this- such one also did quite good
actions to be felt as
pleasure, or at the death-moment such one entered &
maintained
right
views! Caused by that, such good one is reborn in a happy destination,
even in the heavens!
And since such good one furthermore also here & now has been one who avoids all killing
of any
living being,
who avoids all taking what is not given, who avoids all & any misconduct
in sensual pleasures, who
avoids all
false speech, divisive speech, aggressive speech, and all
idle & empty
gossip,
who is neither envious, nor jealous, who is of good will, & who holds right
views, such one will experience the pleasant results of
that too, either here and now, or
in
the next rebirth, or in some subsequent later existence...

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

For details on the mechanics
of Kamma = Intentional Action see:
http://What-Buddha-Said.net/drops/II/Kamma_is_intention.htm
http://What-Buddha-Said.net/drops/II/Buddha_on_Kamma.htm
http://What-Buddha-Said.net/drops/II/Good_Action_dilutes_Evil_Kamma.htm
http://What-Buddha-Said.net/drops/II/Kamma_leading_to_short_vs_long_life.htm
http://What-Buddha-Said.net/drops/II/Kamma_leading_to_Health_vs_Sickness.htm
http://What-Buddha-Said.net/drops/II/Kamma_leading_to_Low_or_High_Birth.htm
http://What-Buddha-Said.net/drops/II/Kamma_leading_to_Wealth_or_Poverty.htm
http://What-Buddha-Said.net/drops/II/Kamma_leading_to_Beauty_vs_Ugliness.htm
http://What-Buddha-Said.net/drops/II/Effect_of_kammic_Action_is_Delayed.htm
http://What-Buddha-Said.net/drops/II/Kamma_leading_to_Power_or_Disrespect.htm
http://What-Buddha-Said.net/drops/II/Evil_Kamma_enhances_other_Evil_Kamma.htm
http://What-Buddha-Said.net/drops/II/Good_Action_enhances_other_Good_Kamma.htm
http://What-Buddha-Said.net/drops/II/Kamma_leading_to_Stupidity_or_Intelligence.htm
