I make you weak at the worst of all times

I make you weak at the worst of all times

I make you weak at the worst of all times

Solve me this:

I make you weak at the worst of all

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.

What am I?

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ANSWER

Fear.