In Egypt, it is the army which is keeping the country together but the street anarchy is spreading fast. Exactly the same is being done in Pakistan. Unless Pak army intervenes decisively, Pakistan would become another Iraq, Syria or libya, astaghfrullah. Egypt is touching the red line now.... Now do you see the bigger game?
Egypt army chief warns of 'state collapse' amid crisis
He made his statement following a large military deployment in three cities along the Suez Canal where a state of emergency has been declared.
More than 50 people have died in days of protests and violence.
Overnight, thousands of people in Port Said, Ismailia and Suez - where some of the worst unrest has been - ignored a night-time curfew imposed by President Mohammed Morsi to take to the streets.
Thousands were again on the streets of Port Said on Tuesday for the latest funerals of those killed, with mourners calling for the downfall of the president.
There were also saw continuing sporadic clashes in the capital, Cairo.
Gen Sisi's lengthy statement appears to be a veiled threat to protesters and opposition forces as well as an appeal for calm and an attempt to reassure Egyptians about the role of the military, the BBC's Yolande Knell in Cairo says.
Gen Sisi's remarks - originally made to students at a military academy - are a strong reminder that the armed forces remain an important political and economic player in Egypt.
The general's comments criticised the destabilising power struggle between the different political forces. He is trying to assert the army's independence and its role as "a strong pillar of the state".
Gen Sisi served on the Supreme Council of the Armed Forces (Scaf) while it temporarily ruled the country, and the army knows its reputation has been tainted by its time in power.
The general now seems to be defining the army's role as recognising the right to peaceful protest while protecting key installations - namely the Suez Canal, one of Egypt's main sources of foreign revenue.
The military deployment along the Suez Canal was meant only to protect the key shipping route, one of Egypt's main sources of foreign revenue, and described the army as "a pillar of the state's foundations", he added.
His comments were made in an address to army cadets which were subsequently posted on the military's official Facebook page.
Gen Sisi was appointed by President Morsi after the armed forces handed over power to him following his election in June.
He replaced Field Marshal Hussein Tantawi who had been former President Hosni Mubarak's long-time defence minister and was chairman of the ruling Supreme Council of the Armed Forces (Scaf) following his fall from power in February 2011.
The latest violence, now in its sixth day, has been focused in Port Said.
Egypt's army
- 490,000 active soldiers
- Military governed between February 2011 until June 2012
- Gen Abdul Fattah al-Sisi (pictured above) is head of the armed forces and minister of defence
- Military's budget not made public or scrutinised by parliament. It is overseen by National Defence Committee made up of military chiefs and cabinet members
- US military aid to Egypt 1.3bn
- According to some estimates army controls 40% of economy
Protesters elsewhere have been marching in opposition to Mr Morsi's authority in the wake of the Egyptian revolution's second anniversary.
In Cairo on Tuesday police again fired tear gas at protesters near Tahrir Square, and the lobby of a major hotel close to the square was attacked, apparently by looters.
The clashes also prompted Egypt's public prosecutor to call for the arrests of a newly-formed anarchist group known as the Black Bloc.
Its black-clad members have been at the vanguard of the latest protests in Cairo. According to its Facebook page, the group is opposed only to the Muslim Brotherhood - the powerful Islamist group of which President Morsi is a member.
Mr Morsi became Egypt's first freely-elected president in last year's election.
Despite promising to form a government "for all Egyptians", he has been accused by the opposition of being autocratic and driving through a new constitution that does not adequately protect freedom of expression or religion.
His recent call for national dialogue has been rejected by his political opponents.
He had urged opposition leaders to attend a meeting on Sunday evening in an effort to calm the situation, but only Islamists already aligned with the president turned up.
Mr Morsi's supporters meanwhile accuse the opposition protesters of trying to oust a democratically elected president by undemocratic means.