Daniel Austin
BBC Sport senior journalist
Mohamed Salah's relentless intensity and refusal to accept lower standards from himself or those around him have underpinned Liverpool's success, and perhaps also explain why he has found criticism of his diminished role tough to handle.
"We are all massively influenced by our past - how we were raised, where we grew up," says Jurgen Klopp, who won every major trophy in English and European football while managing Salah at Anfield. "Mo knew early on [in his life] that he had to do more than others.
"He always developed. He never stops. That is his mindset.
"After each summer break he came back and had a new skill. It was like he had spent the whole time just practising one particular type of pass."
Salah has been criticised by some for not giving more frequent media interviews before his intervention in the mixed zone at Leeds' Elland Road, particularly after defeats and poor performances.
He has been accused of demonstrating a lack of leadership. But he has often delivered calls to arms to fans on social media and those who have played alongside him describe Salah as a man who refuses to give up and is capable of inspiring others.
"He will always be trying to prove someone wrong," says former Liverpool team-mate Adam Lallana.
"He is not macho. I would often tell my children about how he behaves, how he doesn't get too high in good moments, doesn't beat himself up too much in low moments. He would always remain completely focused on the job in hand.
"I would look at him and it would make me feel calm because of how in control he would be all the time.
"Knowing Mo, he will always be fighting, being resilient, and trying to find ways to better himself."
James Milner, Liverpool's vice-captain during most of Salah's time at the club, says: "He is a really nice guy, considering the success he has had - being a superstar around the globe.
"You need different types of leaders, and Mo is a big leader in that group, in terms of the standards he set every day. When you have young players come and sign, they see him and it's 'this is what it takes to be a top player, this is what it is to be a Liverpool player'."
Read more on the real Mohamed Salah here