Answer:
What is so delicate that saying its name breaks it?
It's in your hand though you cannot feel it. Only you and time can reveal it.
Where is the ocean deepest?
What goes through a door but never goes in and never comes out?
No sooner spoken than broken. What is it?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.