Setbacks and challenges can erode one's confidence in the power of discipline, but it is discipline that will overcome the setbacks that you encounter.  Faith in the process and the daily commitment to improvement is what overcomes the challenges we all face.  Discipline is the mindset to press-on in the face of adversity and the commitment to do what is required to accomplish your goals.  It is the core of the process for improvement, success and even peace of mind.  Discipline is is even the potential source of happiness that we are all searching for.  When challenged with uncertainty look to your discipline as the source for your solutions.

Discipline is built by consistently performing small acts of courage.  Robin Sharma

Discipline is doing it no matter what your emotional state is.  Anonymous

Your level of success is determined by your level of discipline and perseverance.  Anonymous