Instinctual drives
The heart exists at the level of the human soul rather than at
the level of the animal soul. And unless the instinctual drives
in the animal soul are confronted, they will confine -- and ultimately
control -- the human soul and heart. One way that the instincts
manifest themselves is in aggression. When getting what we want
is blocked or frustrated, we often feel anger, hatred, and revenge.
These feelings and our desire to express them can become powerful
forces against our love of truth. We’re more interested
in getting angry than in recognizing the truth, more interested
in making somebody suffer than in inquiring into what's going
on. These tendencies are driven by an instinctual force. Of course,
fears are also involved because we're anxious about survival and
anticipated losses. (Spacecruiser Inquiry, pg 136)