The question by the Greek Conqueror descendent King Milinda and Bhikkhu Nagasena is very deep
Its speaks of 3 period (past , present and future ) and in two layered karma
Mean when we commit evil now , we see present fruition (quarrels ,unhappiness ) and future fruition (rebirth in evil realm )
just a quick preface , so as to not to confuse everyone with those really deep Abhidhamma terms
Soon I will explain the 12 Dependent Origination Bhikkhu Nagasena discuss on this thread