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Why can we not say the names of certain angels aloud?

I have found in certain kabbalistic documents that contain names of angels there is an instruction not to say the names of those angels aloud - example with names in parenthesis. I realize we are not ...
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Saying names of angels

I've heard you shouldn't say the names of angels, except for the four that surround us at night. What's the source and reason for this? Is it halacha or kaballah?