The 71-year-old veteran actor, famous for his "Khaamosh" dialogue, was speaking during a session at Sahitya AajTak.
"Now it seems that we all have become silent. There is silence in the current atmosphere of the country," Mr Sinha said.
The actor added when he travels to Pakistan, kids ask him to recite his famous dialogue "Khaamosh".
The actor was in conversation with former journalist and writer Bharti Pradhan and anchor Punya Prasun Vajpayee about his biography "Anything but Khaamosh".
Talking about the book, Mr Sinha said, "I gave the first copy of my book to President Ramnath Kovind. (But) couldn't give it to Prime Minister Narendra Modi, as it didn't come out by the time I last met him."
He revealed that he made his foray into politics after he was advised by senior BJP leader LK Advani.
Mr Sinha also said he never saw the roles that he took up "as good or bad" but just tried to do his best.
"My mantra to the young generation is to prove yourself that you are the best. If not, then prove that you are the most different. Be original and don't lose hope," he added.