There are a lot of occasions in life that require a bold ‘NO’ to get along. Where, when and how to say ‘NO’ is very crucial. This recognition should be nurtured in an individual's mind from the childhood onwards. For this to happen, children should get plenty of opportunities to witness the respectable persons in their family and neighborhood say ‘NO’ at the right place, time and in an acceptable tone. Such ‘NOs’ shall actually contribute for the social wellbeing and thereby ensure a calm and pleasant life.
Practice it and make it a habit. Then the nature will make it sustainable by triggering necessary genetic engineering!