it is something like O.E. : never have to say never, because at the least thoughtful moment "that" can happen to us. Another maxim to explain this sentence would be "By mouth dies the fish". Because if you're talking, you're going to have to swallow your words at a certain time. Another saying that might serve to explain the case a little more is that of "Never spit up". . . because the spit could fall back into your mouth.
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