Dalai Lama: 18 Rules of Life - Take into account that great love and great achievements involve great risk. When you lose, donâ€™t lose the lesson. Remember that not getting what you want is sometimes a wonderful stroke of luck.
Create first a good habit, next push on to create a good lifestyle. I do not know how accurate 21 days and 90 days are in terms of creating a habit and lifestyle respectively. But I do agre. (Nice Try Health Fitness)