Choose right over what is easy

[B.G.]

No: HPFGUIDX 128759

DD tells all gathered in the Great Hall at the end of GOF "...we are 
all facing dark and difficult times ....remember, if the time should 
come when you have to make a choice between what is right and what is 
easy, remember what happened to a boy who was good, and kind, and 
brave, because he strayed across the path of Lord Voldermort.  
Remember Cedric Diggory".   

Why use the phrase "strayed across the path of LV"?  Is it to point 
out that Cedric was not prepared for battle?  Why does he point out 
Cedric was good, kind and brave?  It doesn't matter how good, kind or 
brave we are, it matters how prepared we are?

Up to this point DD has been teaching Harry lessons in modern-day 
Stoic philosophy - learn to use reason over emotion.  LV taps into 
emotion and uses it against his foes.  In this speech isn't DD calling 
for all to use emotion - the very thing that gives LV power?  I'm 
confused.

Olive H.