One, the idea of being in debt: Despite living abroad among many cultures for more than a decade, the essential Indian idea that I am not the centre of the universe but rather a beneficiary of the universe, and therefore, in debt. The sense that I have a natural obligation to all around me and to the nature, never went away.
Two, the fact that the divine is inside the beings, human, non-human and even innate, an idea central to Hindu thought and ingrained in the culture I grew up with, survived all the challenges. There is an essential unity between this and the Kantian ethics of never treating humans as a means, but always an end in themselves.
Three, the idea that the human civilisation and the nature are not in a dialectical relationship, but rather a harmonious one (one would claim such ideas come easy to people from Ganges delta, where nature was so abundantly gracious), is an essentially Indian idea, though one gets to appreciate this only through the interaction with other ideas.