As any jazz musician knows, it takes flexibility and adaptability for improvisation to create beauty.
Whenever I'm in need of inspiration and mantras, I go straight to simple affirmations. 'I am strong', 'I am brave', 'I can do this' and 'I'm awesome'. Whatever you put after 'I am', you will become. 'I am' are the two most powerful words, so make sure what you say after 'I am' is what you want to experience. It's like a magic trick.