Musar su Salmi 50:16

Our Sages instituted (Berachos 4b) that before beginning the Shemoneh Esrei one must say the verse, “Hashem, open my lips and my mouth will tell of Your praise” (Tehillim 51:17). This is a plea that the Holy One Blessed is He accept our prayers with favor and not say, as He does to the wicked, “What business do you have relating My statutes and bearing My covenant upon your mouth?” (Tehillim 50:16). The Creator, may He be blessed, is disgusted with the prayers of a person whose deeds are despicable. What, then, is the purpose of his life? He would be better off dead than alive. Therefore when a person stands up to pray let him do so in fear and trembling and let his heart and mouth be in accord as the declare the unity of Hashem’s great name with complete intention during the Shemoneh Esreh.. Then the Holy One Blessed is He will call him by the name, “Peace,” and for the rest of his life this will be his name On High throughout all the firmaments. Thus the Zohar teaches (2:200b), “When he leaves this world his soul ascends, passing through all those firmaments and encountering no protest. Then the Holy One Blessed is He and all His hosts call him ‘Peace,’ as they open before him twelve gates of pure balsam.”