Sisi, who is expected to easily win the May 26-27 election, said last week that democratic aspirations expressed in mass protests since 2011 were affecting national security and slowing a much-needed economic recovery.
"The future of freedoms and democracy is protected by the constitution which the people agreed on," Sisi told a gathering of intellectuals and thinkers today, a statement from his campaign office said.
Egyptians adopted a new constitution in January after a previous version was suspended when Sisi ousted Islamist president Mohamed Morsi in July last year.
Sisi said he understood the concerns of intellectuals, saying there was "no place for a religious or military state" in Egypt.
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"It is always a difficult equation a state faces: how to achieve sufficient security that is satisfactory enough for the people without breaching the principles of democracy and human rights and without oppressing the innocent," the retired field marshal said.
At a round-table discussion with Egyptian journalists last week, Sisi had warned that democratic aspirations were hindering national security.
"You write in the newspaper, 'No voice is louder than freedom of speech!' What is this?" Sisi asked them.
He also said that given the situation in Egypt, which cannot be compared to Western democracies, it could take "20 to 25 years to achieve true democracy" in the Arab world's most populous country.
Since 2011, Egypt has seen two presidents ousted after mass street protests, a deadly crackdown on protesters and militant attacks that have left it deeply polarised and the economy in a shambles.