Nobody values your time but YOU.
The value of a promise is the cost to you of keeping your word.
Never complain, never explain. Resist the temptation to defend yourself or make excuses.
Persisting through lesser difficulties builds your capacity to persist through greater difficulties, and achieve even greater things.
Be clear about your goal but be flexible about the process of achieving it.
Happiness and high come to you when you choose to live your life consistent with your highest values and your deepest convictions.