Eisnstein said, "Science without religion is lame, religion without science is blind."
He did not specify which religion he was referring to. There is one important ingredient common to all religions. It is that a human being is not just a walking piece of meat. A human being has a spirit to guide his actions. In this respect, what he said can also be applied to metaphysics. It will read, "Science without metaphysics is lame, metaphysics without science is blind."
The definition of death has changed with time. It first cited the stoppage of breathing. Then it was defined as when the heart stops beating. Now it refers to brain death. It is getting closer and closer to the truth. In metaphysics, death is the permanent desertion of the body by the spirit occupying the body.
Without acknowledging the existence of spirits, science will be limping along. Without using logical argument and scientific technique, the practice of metaphysics cannot see light ahead.