It is said when we affirm a fact or action and make it clear that we will not be part of it. And, after time, we see ourselves in the need to be part of such fact or action. Examples : I would never fall in love with a person like that. . . and after a while that person is our boyfriend (a) and sometimes husband ( a) . Similar to this expression is "a talker falls sooner than a lame one."
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