If one feels that he will be unable to have in mind that he is standing before Hashem, he should not daven. But if one feels that he is unable to understand the translation of what he is saying, he should nevertheless daven. This is because if one does not have the kavanah of knowing that he is standing before Hashem, mi’de’oraisa the tefillah is not good. However, the kavanah of knowing the translation is only a requirement of the rabbanan; hence one should daven in order to fulfill his obligation mi’de’oraisa.
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