Each state had a "culture, (its) own thinking, own way of expression and food" and such diversity was the country's strength and not weakness, he told reporters here.
But for the BJP it was "weaknesses and these different ideas need to be crushed... BJP and RSS are under the impression that one idea can be placed on top of India," Gandhi said, without elaborating.
Stating that this attitude of the BJP was conveyed by leaders at the DMK event yesterday, Gandhi said he wanted to tell the people of Tamil Nadu and India that "India is not one idea."
"We are not going to allow one single idea of the RSS - the bankrupt idea, to invade this country and we are going to fight the RSS together," he said.
Opposition parties stood united and they would fight together and defeat the BJP and the RSS, he added.
The Congress Vice-President also said "cultural imperialism" of the BJP was not acceptable to the people of the country.
Answering a question about forming a political alliance against the BJP, he said "We are apprising the idea."
India was a mixture of different ideas, Gandhi said, adding he told party leaders that Tamil culture was the way people of Tamil Nadu expressed themselves and it had to be respected.
Against the background of its ally DMK accusing the Centre of "imposing" Hindi, the Congress leader said all languages needed to be respected.
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