By discipline, education, and example

"Smith admits, that experience of how certain actions tend to elicit pleasant sentiments and others unpleasant ones would lead us to form ‘general rules which determined what actions are, and what are not, the objects of each of those sentiments’ – that is, a morality. Once established, however, we could find ourselves appealing to these rules ‘as the ultimate foundations of what is just and unjust in human conduct’. They can if necessary supply a standard of ‘duty’ sufficient in itself to operate as ‘the only principle’, ‘directing their actions’ even without a moral sense based on propriety. ‘There is scarce any man, however, who by discipline, education, and example, may not be so impressed with a regard to general rules, as to act upon almost every occasion with tolerable decency, and through the whole of his life to avoid any considerable degree of blame'. (Adam Smith, The Theory of Moral Sentiments) Smith’s emphasis on fostering individual moral judgement rather than laying down a set of rules, however, makes this seem second-best. " (Adam Smith, The Theory of Moral Sentiments)

What does the emphasized phrase mean here?