Patrick Mouratoglou has been posting short videos on FB that I found very useful. Here is one:
” … they all tell you ‘I want to be number one in the world.’ How many believe it? They all wish to be #1 but very few want to be #1. To be able to want it, you have to first believe it. 99% of the players they wish and they don’t believe. So, they don’t do everything on a daily basis to become #1 because they don’t believe deep inside. There are so many doubts. If you let the doubt take you, you’re done. Serena and Venus’ father says, ‘Never let the doubt enter your house’.”