There is a Chabad tune sung to the words, "Behold, You are a God Who conceals Himself."
Surprisingly, this is a happy, even a joyful tune.
The Baal Shem Tov used to say that any hiding of God's countenance that we recognize as such is no longer a concealment.
Concealment of God's countenance ceases to be meaningful at the moment that we know that God is hiding from us and has not gone away.
As long as a person thinks that God does not exist, he remains in darkness.
But when he realizes that God is merely hiding, there is no longer darkness but light.
Moreover, as has been noted, in concealment there is a revelation of God's being that is higher than the revelation of God through the agency of the worlds.
–Rabbi Adin Steinsaltz
From Learning from the Tanya by Rabbi Adin Steinsaltz