Answer:
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
What has a single eye but cannot see?
I make you weak at the worst of all times. I keep you safe, I keep you fine. I make your hands sweat. And your heart grow cold. I visit the weak, but seldom the bold.
Be sure to shout for its answers are weak, but there is no language it cannot speak.
The higher I climb, the hotter I engage. I cannot escape from my crystal cage.
Iām grown from darkness but shine with a pale light. Very round I am and always a lady's delight.