The Mind, because of Williams's matchless ability to focus under pressure.
Serena became the first woman over 30 to win Wimbledon since Martina Navratilova in 1990, while her 102 aces were the most in an All England Club campaign. Moreover, given the times she has tumbled from the top of the world rankings following tragedy or injury, only to rise again - as she did following the 2003 death of her sister Yetunde, foot surgery in 2010 and a life-threatening pulmonary embolism in 2011 - it's easy to assume Williams's return to world-beating form was a certainty after maternity leave. For a time afterward, she could barely walk to the mailbox. "I'm just enjoying every moment", Williams added.
It took Kerber two tries to serve out the victory, getting broken to 5-2. Her win sets the stage for a redux of the 2016 Wimbledon final in which she defeated Angelique Kerber, who will also be her 2018 opponent.
It has all meant that Williams, who will be watched on Saturday from the Royal Box on Centre Court by her good friend the Duchess of Sussex, is the favourite for a title that will make her the fourth Grand Slam-winning mum of the Open era. She lost in the quarterfinals to 12th-seeded Jelena Ostapenko.
There are potential parallels.
The 23-time major victor can match the Australian legend's total of Slam titles on Saturday, though Williams already holds the record for most Open Era crowns won.
Prince Harry and Prince William will remain at home while their wives cheer on Serena Williams at Wimbledon. But Williams said that she had not been thinking about it here. That's why she is there where she is now.' About Kerber, Serena said: 'It's her second final in three years, is that right?
But this is the only tennis that the tempestuous 21-year-old Latvian knows.
"As I said in the past couple years, I don't want to limit myself, " Williams said. "I think grass is [Kerber's] best surface".
"For me, having to deal with PEs is more mentally challenging because if I have a pain in my leg, I automatically go to the worst-case scenario", she said. "It's just a number".
"With me, of course, she was more defensive player because I hit the ball much harder". That is the kind of mistake Kerber can not afford to make again Saturday, when she faces Williams for the eighth time in her career, and only the second time on grass. "It's such a great feeling".
"I still have a match to win", she said. "This is about people - male, female, black, white, rich, poor - that are on the floor and don't know if they can get up and do anything, and it's about nothing is impossible".
The semifinal between Williams and Goerges began on a high note, marked by high quality serving and a robust exchange of ground-strokes.
Williams also moved past Billie Jean King to sixth in the all-time list of female Grand Slam singles champions with 13 major titles.