This morning I found a mantra that works for me. Whenever my mind started wandering during my practice, I repeated to myself, Yogas citta vrtti nirodhah - To restrain the whirl pools of the mind is yoga (Yoga Sutra 1:2). It simply popped into my head while I was practicing and it is the one Yoga Sutra of Pantanjali that I have been able to remember in Sanskrit.
As soon as my mind wandered to what I had to do during the day - what we were going to have for dinner, work, yoga training, my lack of a career, my inability to bind in Marichyasana D - I repeated this in my mind with real conviction and belief. Now to say that this worked is just me telling you it did but I have actual proof. As I reached Marichyasana D I kept repeating my mantra while slightly smiling so that I was focused and in a decent frame of mind. I went into the asana with no expectation on the second side and what do you know I actually was able to clasp each hand, bind and hold the asana for 7 breaths without an inkling of pain in my right ankle! I can tell you that at that moment I broke into a real, genuine smile - it was a moment of pure bliss. The moment I chose to let go and just be was when what I have been striving for actually surfaced.
Now we'll see if I can do it tomorrow :-)