קְרָ֥א אֵלַ֖י וְאֶעֱנֶ֑ךָּ וְאַגִּ֧ידָה לְּךָ֛ גְּדֹל֥וֹת וּבְצֻר֖וֹת לֹ֥א יְדַעְתָּֽם׃ (ס)
Call unto Me, and I will answer thee, And will tell thee great things, and hidden, which thou knowest not.
Read kabbalistic (mystical) interpretation of Jeremiah 33:3: and classical mystical sources.