"On 'International Day of Persons with Disabilities', I salute the indomitable spirit of all persons with disabilities. They are our heroes," Modi tweeted.
In another tweet, he said it was a day "to pledge our commitment towards our unwavering support to persons with disabilities & ensuring equal opportunities" for them.
"Let us all work together to create a world where persons with disabilities can scale new heights of success without any obstacles," the Prime Minister said.
"We remember his monumental contribution in the making of our Nation... Rajen Babu remained devoted to serving the poorest of the poor. His service & impeccable values remain an inspiration for generations," he said.