יְהוָ֗ה אֱ֠לֹהֵי אַבְרָהָ֞ם יִצְחָ֤ק וְיִשְׂרָאֵל֙ אֲבֹתֵ֔ינוּ שֳׁמְרָה־זֹּ֣את לְעוֹלָ֔ם לְיֵ֥צֶר מַחְשְׁב֖וֹת לְבַ֣ב עַמֶּ֑ךָ וְהָכֵ֥ן לְבָבָ֖ם אֵלֶֽיךָ׃
O LORD, the God of Abraham, of Isaac, and of Israel, our fathers, keep this for ever, even the imagination of the thoughts of the heart of Thy people, and direct their heart unto Thee;
Read kabbalistic (mystical) interpretation of I Chronicles 29:18: and classical mystical sources.