Positive feelings come from being honest about yourself and accepting your personality, and physical characteristics, warts and all; and, from belonging to a family that accepts you without question.
There are physical characteristics which are inherited. These include things like good looks, high intelligence, physical coordination. These attributes contribute to success in life, and success in life is a determinant of optimism. Martin Seligman
Language is possible due to a number of cognitive and physical characteristics that are unique to humans but none of which that are unique to language. Coming together they make language possible. But the fundamental building block of language is community. Daniel Everett
The native Jewish families in Jerusalem, as well as those in other parts of Palestine, present a marked difference to the Jews of Europe and America. They possess the same physical characteristics - the dark, oblong eye, the prominent nose, the strongly-marked cheek and jaw - but in the latter, these traits have become harsh and coarse. Bayard Taylor
I think the themes of belonging and parentage and love are obviously universal.