Kell Brook revealed he defied his team's wishes to return to welterweight and accept the challenge of defending his world title against unbeaten American Errol Spence Jr.
Eight months on from stepping up two classes for a loss to Gennady Golovkin at middleweight, Brook defends his IBF World Welterweight belt that against Spence in front of 27,000 fans at Sheffield's Bramall Lane tonight.
The 147lb-limit, which 31-year-old Brook was inside at Friday's weigh-in, has therefore been even more challenging thanks to a gruelling 12-week camp in Fuerteventura.
Yet Brook claimed his determined nature was the reason he ignored advice from those close to him urging him up to move up a class, with a desire to hang on to his belt overriding anything else.
"I've put myself through it," he said of his preparations to face Spence.
"My team wanted me to move up to 154 (pounds) but I'm a stubborn guy, it took me all my career to get that world title and beat Shawn Porter.
"There's no way that I want to move up and just give that title up. You've got to take it away from me, rip it out of my hands. I'm passionate and this belt belongs with me.
Spence may be the challenger, but he has also been made the favourite to dethrone Brook in South Yorkshire thanks to an impressive 21-0 record that has seen the hype surrounding him rise.
Brook's counter to such odds is that none of his challenger's previous opponents could hold a candle to him.
"I love a challenge; I've proven these guys wrong before and I'm going to do it again," he declared.
"There are question marks over Errol Spence, he's never been in with a guy like me. He's never been in with anything close to someone like me. There's question marks and we're going to get them answered on Saturday night."
Brook's bout with Golovkin was one of boxing's highlights of the previous year as both fighters earned widespread acclaim for the spectacle.
The former thinks another classic could be in the offing with Spence and he would not be surprised if both men are knocked down before a conclusion is reached.