Commander Spock : When you've lived as many lives as he... fear of death is illogical.Doctor 'Bones' McCoy : Fear of death... is what keeps us alive.
There's no such thing as the unknown, only things temporarily hidden, temporarily not understood.
Commander Spock : It is unwise to trivialize that which one simply does not understand, Doctor. We can safely assume it is more important than a doodad.Doctor 'Bones' McCoy : I think you just managed to insult me twice, Spock.
You really want to head back out there, huh?