הֲלַמֵּתִ֥ים תַּעֲשֶׂה־פֶּ֑לֶא אִם־רְ֝פָאִ֗ים יָק֤וּמוּ ׀ יוֹד֬וּךָ סֶּֽלָה׃
Wilt Thou work wonders for the dead? Or shall the shades arise and give Thee thanks? Selah
Read kabbalistic (mystical) interpretation of Psalms 88:11: and classical mystical sources.