"A nation's culture resides in the hearts and in the soul of its people."
-Mohandas Gandhi
I believe this quote is saying that despite the control of another nation, such as Britain, and their attempts at assimilation, or the attempt to practically force their culture onto another, such as onto India, that the native's original culture still exists in their hearts and souls and that it will never go away despite these attempts. It's saying that a culture is not something that can be taken away.
My opinion is that this is completely true, a culture is something that's existed since the beginning of time and that it's different per nation, per country, per region, per religion, etc. Your culture is something that cannot just be taken away from a person or group. It's something that has always existed and always will.