Power the Dark Lord Knows Not

[gelite67]

No: HPFGUIDX 128111


I was reading some of the recent threads regarding the prophecies and 
it hit me:  Are we certain that the power that the Dark Lord knows 
not is a power that he didn't know of at the time he tried to kill 
Harry? 

Assuming that Harry is the person to whom the prophecy refers (not 
trying to start a thread on that topic), could he still/currently 
possess a power of which LV (and the rest of us) are unaware? Or 
perhaps it is a power that Harry hasn't even gained yet?

Seems like Harry either possessed the power at that time or he 
didn't.  Even if he did, that doesn't mean that LV knew of that power 
then, or knows of it now.  If Harry didn't possess the power, 
couldn't he gain the power at a later point?  If the series makes 
anything clear, it is that the power of a wizard grows/changes over 
time.

It just seems that JKR wants us to assume that Harry's power to love 
and feel love is that power of which the Dark Lord know not.  But LV 
knows/knew about the power of love.  He may have forgotten about it 
or discounted it, but he knew about it.  So then, how can that be the 
power that he knows not?