"Jurek was a ubiquitous person, in all ways sociable, he constantly acquainted people with one another and liked to be in the center of attention. He was extroverted, he felt best in company, which he liked to surprise with his funny sayings and stories and often controversial opinions on various life topics. He also liked to talk about himself and his achievements and belonged to a small group of people who took care of writing down the details of their biography and continually supplementing it with descriptions of subsequent events. Obtaining further awards or honorable functions was carefully recorded. When I once asked if it wasn't a waste of time for him, he retorted with his inborn charm and a specific sense of humor: "... of course not, this will be another line to my obituary. And yet, my dear, there are many indications that you will take part in writing it, so be happy that just in case you will have something like ready "crib sheet" and above all "first hand" data so at least you won't mess up anything." Jurek's prophetic words, it was so, I did not have to look for that data because I had it in my computer."

“He is an outstanding pharmacologist and at the same time a man who is obsessed with popularizing – in the best sense of the word. He does it great, gathering thousands of listeners on various occasions.”

“A truly Renaissance personality. Absolutely undisputed authority, world-renowned scholar, a real neuroenthusiast who can also spray such a cascade of wit and humor that all anecdotes should hide!”

“Empathy and aggression – although seemingly very distant from each other – have a largely similar neurobiological background and are often intertwined. Besides, our entire legal system is based on the fact that excessive empathy activates centers of aggression.”

“As I walk through my beloved Krakowski Park and pass by a group of young people from which I can smell beer, I give them a wide berth. But when I feel the weed, I go boldly through their group and sometimes chat. Yes, the abuse of marijuana causes trouble with memory, concentration, but it is a short-lived condition. I'm not talking about extreme cases, but there are few of them. Less than after alcohol. Oneself should sometimes detach from reality to deal with it somehow.”

“I met Jurek many years ago when he was only little older than his beloved grandson now. And he was just as nice and at the same time extremely handsome!”

“With all due respect for the title of professor. Vetulani, however, is a unique moron.”