When he was the president of India, he made it a point to mention it in almost every speech he delivered.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/kalams-idea-bridge-rural-urban-divide-has-few-takers
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/business-standard
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rural-development
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india