Stupid riddle

So I was asked a riddle recently, and I can't figure out the answer.  It has only been about 5 hours, but its killing me not knowing the answer.  I think I'm not going sleep tonight, just because I can't figure it out. 

"It is smoother than silk, softer than rose petals, stronger than a wall, more resilient than a forest, desired more than diamonds, and scarier than the darkest pit."

...I think I'm going to come up with a really obscure riddle just to mess this person up.