"G-d stands over him, and the whole earth is full of His glory, and He searches his mind and heart (to see) if he is serving Him as is fitting." (Tanya, Chapter 41)
Imagine you were in the palace of a king. The rooms, the walls, the gorgeous furniture - all around, everything is splendid. Princes and rulers, dressed in gold and silver, stand about in awe, waiting to do the king's command, or even just to see him, You pass amongst them all, and suddenly find yourself...before the king! No one says a word. The king is looking right at you, watching with interest as you come near. Imagine how you would feel!
In fact, that is exactly how we do stand all the time before Hashem, the king of all the world!