This fact of the common human blood stream flowing in us all accounts also for the cases of those individuals not belonging to the same family who not only have psychological traits and emotional biases which cement them into a close friendship, but who may even look more like each other than either one of these with the members of his own family. In the last analysis we see that man inherits from himself. Heredity is character and character is heredity. And even in the case of the purely physical heredity, it can be said that man makes his own body, the parents merely providing the workshop and to some extent the materials with which it is built. The incarnating entity is the directing power behind the scenes.
Man is an individuality.
He has free will. He is changing from day to day, from year to year, from life to life. He is not static. He is building now what his character will be in his next incarnation, and when that next incarnation arrives he will bring himself with him into the new life. He is thus his own heredity, his own character, his own karma.