עַד־ע֭וֹלָם אָכִ֣ין זַרְעֶ֑ךָ וּבָנִ֨יתִי לְדֹר־וָד֖וֹר כִּסְאֲךָ֣ סֶֽלָה׃
For ever will I establish thy seed, And build up thy throne to all generations.' Selah
Read kabbalistic (mystical) interpretation of Psalms 89:5: and classical mystical sources.