Working for softness and power is like walking a 'tight-rope.' When you ride forward you create power. That power needs to be harnessed and not blocked to allow the horse to find self carriage. That one stride of self carriage will come and go but eventually you will have several strides or movements of it. And it's a glorious feeling.
Sometimes we spook at banners or dogs, but what keeps us together is concentration, feel, and glue.
Harmony in Balance
Learning how to control each step, and half step, of the horse takes a lot of focus, concentration, and feel. Its about balancing the horse between your driving aids, woahing aids, and left and right side until the harmony in balance is created naturally under the saddle.