unknown

a person is often reluctant to try something unknown 

because unknown tasks feel difficult 

eating a new type of pizza on a restaurant is easy 

because eating pizza is a known task 

but eating a completely new type of food is an unknown task 

and thereby there is a reluctance to do it 

carrying heavy shopping bags home from the shop 

that task is heavy, but easy 

because it's a known task 

that's been done many times before 

using dark arts could feel difficult 

because it's unknown 

but avoiding to use dark arts 

because it feels unknown 

could lead to failure