In terms of playing ability ...

In terms of playing ability there is nothing to choose between number one and 100. Instead, it's a question of who believes and who wants it more? Which player is mentally stronger? Which player is going to fight the hardest in the big points? These are the things that determine who is the champion.
 Novak Djokovic

Quotes from the same author

My mother is a special story. She went through so much to bring us up, four men at home, especially when our country was going through really difficult times.
 Novak Djokovic
I physically feel very fit. I’m very motivated to keep on playing on a very high level. I’m going to try to use these years in front of me to fight for the number one of the world and fight for the biggest titles.
 Novak Djokovic
I still feel young as far as motivation is concerned, and also the challenges that I have for the future and what I want to achieve. So I just hope this successful streak is extended to the fullest.
 Novak Djokovic
It is very important and my success very much depends on the harmony that I feel in my private life. It is essential for me to be happy in my private life. And if it continues, I am able to continue playing tennis.
 Novak Djokovic
People look up to me as somebody who is able to switch the image of our country from negative to positive.
 Novak Djokovic