Almost everything important in life is invisible.
I think people believe empathy to be compassion, that compassion is an inner sense (a sense of the soul). But empathy is a sense, while compassion isn't a sense. Empathy is an affinity, a communion, a...
If there really is a definable 6th sense, it would be the natural connection and the ability of communication between man and animal
Have good sense, smell the scents, and you will have more cents