Robert Plomin

"We now know that DNA differences are the major systematic source of psychological differences between us. Environmental effects are important but what we have learned in recent years is that they are mostly random – unsystematic and unstable – which means that we cannot do much about them."

"Understanding how DNA makes us who we are will teach us to be more tolerant of each other."

"DNA isn’t all that matters but it matters more than everything else put together."