Heaven is....

...when you're enjoying something so much, that it doesn't matter how good the competition is, and you're enjoying it so much that you can't stop smiling. And the moment takes over and you lose yourself in it.
...when you somehow pick up the courage to do something you're reputed to be bad at (singing!) and give it your all.
...when you realize the beauty of music. When you experience how easily your soul is set free when you sing.
...when you completely understand a week of quantum classes :) and manage to ask sufficiently insightful questions at the end of every class . :D