Cry out to me and I will heed you. And I will announce to you great things, things that are certain, though you do not know them
Other versions
King James Version
Call unto me, and I will answer thee, and shew thee great and mighty things, which thou knowest not. English Standard Version
Call to me and I will answer you, and will tell you great and hidden things that you have not known.New International Version
'Call to me and I will answer you and tell you great and unsearchable things you do not know.'