Spiritual joy is of the nature of the Exodus from Egypt.
It has been said that the Exodus represents the emergence of the self from the narrow place of restriction, the breaking out from the gloomy darkness into joy.
It is not a matter of ignoring the existence of evil that surrounds and is within one, but rather of using the evil and transforming it in the process of living.
–Rabbi Adin Steinsaltz
From The Long Shorter Way by Rabbi Adion Steinsaltz