Convenience
People drop out of school quoting Bill Gates, Steve Jobs and Mark Zuckerberg. You can too, if you are studying in MIT or Stanford or the like.
People talk about not working as hard using quotations of Lincoln, APJ Abdul Kalam and the like. You can too, if your value equals the likes of them.
People resort to non-cooperation and civil disobedience quoting Gandhi or Martin Luther King or the like. You can too, if your ethic and mission are as pure.
The rest is your convenience.