Cortana is the next stage in human evolution. The Spartans were the first step. Cortana is the upgrade. She represents the sum total of every available data point. The intelligence of the galaxy, in essence. With Cortana, we will create Spartans who are more lethal, their judgment error-free, their performance upgradeable, and, most importantly, controllable. - Catherine Halsey (Halo The Series Quotes)

Cortana is the next stage in human evolution. The Spartans were the first step. Cortana is the upgrade. She represents the sum total of every available data point. The intelligence of the galaxy, in essence. With Cortana, we will create Spartans who are more lethal, their judgment error-free, their performance upgradeable, and, most importantly, controllable.

Source:S1.Ep2: Unbound
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