There really is only good and evil and nothing in-between. Dualism is also the trademark of the occult world

a) ONLY, adjective - "single; one along; this and no other"

b) good AND evil contradicts "only"...there can be only one.

c) ones consent to suggested moralism establishes the good vs bad conflict of reason aka dualism.

d) ONEs consent to another ONEs suggestion tempts one to ignore perceivable for suggested, hence keeping perceivable hidden (occult) from ones perception.