This leads us to a disturbing thought that perhaps at some later stage of evolution, man and machine may become one. This means that the Borg do not think independently, nor are they considered as individuals in their own right. Thoughts are collective, rather than individual. The Borg operate in a unified harmony, although they have sacrificed individual liberty at the cost of achieving a collective identity. This concept is the antithesis of human perceptions of the self and individuality which differentiate human beings from each other.
Humans are rich in emotions and their actions are sometimes guided by their emotions.
The Borg, on the other hand, have muted feelings and emotions and share in a network of thought which comprise the Collective. As recently discovered in a Voyager episode, Human Error , the Borg's emotions have been suppressed by implants. When Seven encountered a certain level of simulation, her critical node shut down her brain functions. Furthermore, if a Borg drone dies or is beyond repair, the Collective will still retain his memory. So in a sense all Borg are immortal.