He said this at the International Conference Centre, Abuja during the launch of the biography of late Brigadier Zakariya Maimalari on Tuesday.
According to Obasanjo, the top most lessons for Nigerians to learn from unfolding events in the country are that the nation has had enough of tragedies.
“What lesson can we learn? The lesson we can learn is that we have had enough tragedies in this country.
The two-time Head of State also gave reasons for some of the decision taken by his government in his second coming as civilian president in 1999
He said he decided to retire Maimalari’s son who was the then Military Administrator of Jigawa State for certain reasons.
Obasanjo said: “I have no apology but I have explanation. It’s because it’s necessary to stop this sort of things that took the life of your father prematurely, that we had to take the decision that all those who have tasted power, that they should never have tasted, of political office that we should ease them out of the Army so that we can have an Army that is free from political aberration.”