its fascinating to me how historical vedic religion and the brahmins were influenced by buddhism (elucidation and emphasis on dhyana in india were popularized by the buddha as well as his contemporary patanjali) as well as jainism, besides the obvious non-vedic puranic influence on what became hinduism (which is itself very diverse). indian religions, even sikhism, use closely related terms and concepts, though buddhists in particular like to emphasize where they are different.