Kovind was addressing the 66th convocation ceremony of the Gujarat University (GU) here.
"Kalam sir was ultimately and fortunately my predecessor. Though he became the president, he was basically a scientist. Thus, I usually refer to him as a 'space scientist' while I call Modiji a 'social scientist'," Kovind said in his address.
"While Modiji was an alumnus of the Gujarat University, Kalam sir too had stayed here for some time," he said.
"...This is a person who was born and brought up here, studied here and then become the prime minister. This was truly inspirational," Kovind said.
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He said Modi opened the doors of the 21st century for today's generation by bringing in various initiatives, such as 'Digital India' and 'Start Up India'.
Kovind urged students to keep in mind the ethos of cooperation and brotherhood to bring in development.
As many as 56,159 graduates of the GU, the oldest varsity of the state, were awarded degrees at the convocation ceremony.