Your future takes precedence over your past. Focus on your future, rather than on the past.
Self-discipline is an act of cultivation. It require you to connect today's actions to tomorrow's results. There's a season for sowing a season for reaping. Self-discipline helps you know which is which.
Discipline is based on pride, on meticulous attention to details, and on mutual respect and confidence. Discipline must be a habit so ingrained that it is stronger than the excitement of the goal or the fear of failure.
Do more than is required. What is the distance between someone who achieves their goals consistently and those who spend their lives and careers merely following? The extra mile.
Thoughtless risks are destructive, of course, but perhaps even more wasteful is thoughtless caution which prompts inaction and promotes failure to seize opportunity.