Another explanation: because it was given in secret due to the accuser.
Another explanation: formless words of on which the world rests. Another explanation: David said before the Holy One, if you have left and abandoned Ya’akov, who is the foundation of the world, as it says “the righteous is the foundation of the world,” (Mishle 10:25) what acts have You done for the ones who keep the commandments? If wicked ones arise and destroy the foundations which face the deeps, the righteous of the world…R’ Yannai said: When a king of flesh and blood enters into the storeroom, he doesn’t know what is in the bed chamber. Not so the Holy One! “The Lord is in His Holy Temple. The Lord-His throne is in Heaven…” (Tehillim 11:4) Looking out and gazing upon all the dwellers of the earth – but no eye sees Him. This is one of the instances when the throne below is aligned with the throne above, as it says “You shall bring them and plant them on the mount of Your heritage, directed toward Your habitation…” (Shemot 15:17) And so to it says “I have surely built You a house to dwell in…” (Melachim I 8:13)