"I would like to take this opportunity to express my gratitude in the experience I had yesterday.
It was a very emotional experience for me, and your caring and understanding of me as a person, helped to get my thoughts and understanding of my abilities into focus.  The need to centre oneself, and realise that mistakes are in the past, and not something to carry into future endeavours, in short to allow me to learn from my experiences and make the right choices for me!