Great people that performed in "Piwnica pod Baranami" often hated each other. - Jerzy Vetulani

Vetulani, Jerzy (2008): Neurobiologia inteligencji. Wiedza i Życie, 2, pp. 14–19 (in Polish).

The expression of aggression is conditioned both biologically and culturally and it can be learned. On the other hand, proper upbringing can completely eliminate aggressive behavior, but it must be remembered that biological conditions remain present and aggression can easily be restored.

My father taught me that in scientific work even the most brilliant intelligence won't be useful if it won't be supported by a long, hard work.