- You cannot harm me before you have strong evidence.
- You cannot harm me until you have strong evidence.
I think 1. is more natural than 2. Am I right?
Maybe 2. isn't correct at all. Is it so?
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At the level of the matrix clause, these two sentences carry much the same semantics. My native reader's eye doesn't see a reason to prefer one over the other.
The word "before" indicates at some prior point. The word "until" indicates at every prior point. Because the finite verb of the matrix clause is negated, either of these phrases in this context indicates at not any prior point.