אֶזְכְּרָ֣ה אֱלֹהִ֣ים וְאֶֽהֱמָיָ֑ה אָשִׂ֓יחָה ׀ וְתִתְעַטֵּ֖ף רוּחִ֣י סֶֽלָה׃
When I think thereon, O God, I must moan; When I muse thereon, my spirit fainteth. Selah .
Read kabbalistic (mystical) interpretation of Psalms 77:4: and classical mystical sources.