Everything I did, and I think everything Martin Luther King did, was because we allowed our lives to be in tune with what we felt to be a divine purpose. And it didn’t matter whether we lived or died. It didn’t matter how much money we made, or what we accomplished.

So given a Time Turner, I would tell my 21-year-old self that personal happiness lies in knowing that life is not a check-list of acquisition or achievement. Your qualifications, your CV, are not your life, though you will meet many people of my age and older who confuse the two. Life is difficult, and complicated, and beyond anyone’s total control, and the humility to know that will enable you to survive its vicissitudes.

Getting rich slow isn't actually slower. It's slower in year one, but it might be faster in year seven.

Never give up your passion for learning. And zoom out of your field before you zoom in. Some of my very best business insights have come from reading around subjects. They have come from approaching questions at a strange angle, from thinking about them from a different point of view. A lot of the knowledge that has really given me an edge in business has come from history, psychology, even chemistry. Connecting seemingly unconnected dots is what has served me well.

Perhaps we should give athletes the right to take a mental break from media scrutiny on a rare occasion without being subject to strict sanctions. In any other line of work, you would be forgiven for taking a personal day here and there, so long as it's not habitual.

I communicated that I wanted to skip press conferences at Roland Garros to exercise self-care and preservation of my mental health. I stand by that. Athletes are humans.