Practice and preach. It is the best way.Nowadays in social media and other places many people post very good postings. They talk about all good practices,ethics,moral values and so many other things. If really these are followed by all this world will be a different place altogether. But telling is very easy,practicing is difficult. How many of us practice and preach instead of only preaching. Many people say, do what I say,but don't do what I do. I think it is not a correct approach.
Once a lady came to Sri Ramakrishna Paramahamsa with her son. She requested the Guru to advise her son not to eat jaggery. The Guru asked her to bring her son after 7 days. She came after 7 days with her son and Guru advised him accordingly. That lady out of her curiosity asked Guru why he has taken 7 days to advise her son. The Guru replied that he was also having the habit of eating jaggery. While he was having the habit of doing that, he should not advise hisson. So these seven dayshe practiced this and then He advised her son. I feel everybody should follow the same. Don't advise without following.