It may be ineffective to daven for a wrong thing if you misdiagnosed the problem. for example, you made an aveira but you think that you did a mitzva and then someone else is harsh to you. So, you then ask Hashem to punish the Rasha (him) and reward the Tzaddik (you).This may involve some tehilim .. Then,if your davening is effective then Hashem will punish the Rasha (you) and reward the tzaddik (him).
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