SINGAPORE - There will never be another Lee Kuan Yew, said Singapore President Tony Tan Keng Yam at his State funeral service on Sunday.

"Over the past week, we have mourned the passing of a man and an era. There will never be another Lee Kuan Yew," he said towards the end of his eulogy.

"No one person can take his place nor do what he did."

Dr Tan, 75, was the second to speak, after Prime Minister Lee Hsien Loong delivered his eulogy at the University Cultural Centre, at the National University of Singapore.

He recalled how Mr Lee insisted on making a trip to his office two years ago, despite his frailty.

"I asked to visit Mr Lee to see how he was doing. With Mr Lee's increasing frailty and out of respect, I planned to meet him at his office," Dr Tan said.

"Mr Lee, however, was adamant that he should come to my office. It took him a great deal of effort. But he did it as a mark of respect for the Office of the President."

This demonstrated Mr Lee's strong regard for the Constitution and the institutions of the State, built on Mr Lee's ideals of meritocracy, honesty and integrity, he said.

"Mr Lee demanded, without compromise, complete integrity in personal and professional matters from himself, his family and his colleagues."

How Singaporeans had come together to mourn Mr Lee's death would have made him proud, he added.

Dr Tan said: "This was what he had worked for his whole life - to build a united people, who respect and care for one another as fellow citizens."

He also recounted how Singaporeans cheered when Mr Lee entered the Floating Platform last year, during the National Day Parade.

While Singapore's founding father will not be there this year, "he will be foremost in our minds. And in our hearts", he said.

Calling on the people to create new opportunities for the next generation, Dr Tan concluded: "I call on all Singaporeans to honour the memory of Mr Lee by working together to achieve happiness, prosperity and progress for our Singapore.

"This will be our tribute to Mr Lee Kuan Yew."

Mr Lee died at age 91 on March 23, and Sunday marks the end of a seven-day mourning period.

The funeral service at the centre is attended by family members, top leaders from more than 20 countries, and about 2,000 invited guests.