That is survival greed.LOL.

What did Buddha discover in the final Nirvana?

Buddha stopped making a toll, and what was the awakening on the bank of the Nelanjarah River?

Well, it was summarized in 12 causes and conditions leading to Nirvana or suffering.
Among them, among the 12 chains, what he finally found is ignorance, more concretely, I want to survive, I do not want to die, common trend of life.
That is survival greed.LOL.

This discovery, truly Buddha, would have been surprising.LOL.

In other words, being alive is painful, suffering.

Living thing minus death = recognition function.
 Recognition function = three results.
 Part 3 result = all, suffering after all, suffering.
  The survival of mankind is born, old, sick, dies.
 These are obviously suffering.
 There are five cognitive functions with obsession of humanity,
suffering.These are obviously suffering.LOL.

So, to keep living, want to suffer, want to continue to suffer. Gahaha.So, how much misunderstanding is the tendency of life that I want to continue to exist, I do not want death? Every now human beings will die. No one can not avoid death.Gyahaha.LOL.
 Survival itself is impermanence. Buddha noticed that human beings want Impermanence = Existence = bitter, suffering. Mankind is just ignorance, metamorphosis, somehow.
So, I hated wisdom for both of these desires I want to keep alive, at the same time, I do not want to die, and apart from that strange desire I made a beyond. So this is the last Nirvana of Buddha. Gahaha.
So Buddha was kind enough to tell everyone the cause of this suffering that he eventually discovered.
So, if human beings observe this strange desire and abnormal desire for ten minutes, if they leave it, it is the ultimate peaceful nirvana, enlightenment. Gahaha.