Here is how I see it:
Jupiter rules Pisces. Jupiter is the planet of ethics and morality. These are confusing topics if you try to get deep about them at all.
Since pisces is a water sign, she does try to get deep about them.
But since Pisces is a dual sign, she finds herself oscillating, bouncing back and forth between ideas. This inclination to be deep about so many complicated issues and thoughts is what makes Pisces indecisive and often beset with confusion. It also gives them inherent potential for extreme intellectual and ethical judition and erudition.
– Vic DiCara