מִֽי־יִתֵּ֡ן וְהָיָה֩ לְבָבָ֨ם זֶ֜ה לָהֶ֗ם לְיִרְאָ֥ה אֹתִ֛י וְלִשְׁמֹ֥ר אֶת־כָּל־מִצְוֺתַ֖י כָּל־הַיָּמִ֑ים לְמַ֨עַן יִיטַ֥ב לָהֶ֛ם וְלִבְנֵיהֶ֖ם לְעֹלָֽם׃
Oh that they had such a heart as this alway, to fear Me, and keep all My commandments, that it might be well with them, and with their children for ever!
Read kabbalistic (mystical) interpretation of Deuteronomy 5:26: and classical mystical sources.