We must understand that our Karma not only affects universe but ourselves as well. If I kill a bird, a bird loses its life but it also affects me. Or, If I save a dog from drowning, it elongates the life of dog but it also affects our soul. Every karma has effect on ourselves (and mind and aatman). At the end of life, it is this aatman changed due to life ...
Guna which dominates you now has a affect in your future rebirth.
If the embodied one meets with death when Sattva is predominant, then
he attains to the spotless worlds of the knowers of the Highest. (BG
Meeting with dissolution when Rajas is prevalent, one is born among
those attached to work. Similarly, one who has met with dissolution
when Tamas ...