I saw a documentary where a priest said that the “dark night of the soul” is mentioned in the Bible, but I was not able to find where.
Is the “dark night of the soul” mentioned directly or indirectly in the Bible?
The words the dark night of the soul are not, to the best of my knowledge, in the Bible. The phenomenon as experienced by real people in real situations is in the Bible, however. One need only think about saints under the old covenant who struggled with what we today would call depression, which is I suggest, one aspect of the dark night of the soul. Perhaps a few examples would help.
Exactly how long Elijah took to emerge from his pit of depression, we do not know. With God's encouragement, with some much needed nourishment and sleep (!), and with God's commissioning him anew, however, Elijah eventually obeyed the LORD and took one step forward, and then the next step, and the step after that, and so on, until he was back to his old self once again and feeling useful in the service of YHWH (see 19:19 ff.).
Psychologically, we might analyze Elijah's obvious depression and attribute it in part to his having had what could be called a peak mountaintop experience (pun intended) and then having to come down from the mountaintop only to be threatened by wicked Queen Jezebel who threatened to take his life (19:2). What was Elijah's response to Jezebel's threat?
If Elijah, that great prophet and miracle worker of YHWH, was subject to depression, might not "average" believers like you and me experience the same dark night of the soul at least once in our lives? I think so.
Here are some of the symptoms David manifested when he came to grips with his sin, as recorded in Psalms 32 and 51:
Elsewhere in Psalms, David reveals other emotions which we generally associate with depression:
I could go on to consider other great personages in the Scripture, since there are more than a few saints who wrestled with depression (e.g., Jeremiah, the weeping prophet), but Elijah and David will likely suffice to illustrate how "this life is the hard one."
Life is not always hard, of course, and Jesus did promise us an abundant, full, and meaningful life (John 10:10). We also need to remember that the LORD renewed Elijah's spirit and restored to David the joy of His salvation. Then, too, the fruit of the Spirit is "love, joy, peace, patience" and more (Galatians 5:22 ff., my emphasis), so we needn't feel we are on our own in getting victory over depression.
In conclusion, not every Christian today should expect to wrestle with chronic depression. By the same token, however, no Christian can expect to be on a spiritual mountaintop all the time. Sooner or later he or she needs to descend into the valley--or as John Bunyan called it in Pilgrim's Progess, the "slough (slaʊ) of despond"--and experience at least some of the symptoms of the dark night of the soul, if only for a season.
The phrase “dark night of the soul” comes from a poem by St. John of the Cross (1542-1591), a Spanish Carmelite monk and mystic, whose Noche obscura del alma is translated “The Dark Night of the Soul.”
Its meant to be synonymous with traveling the “narrow way” that Jesus spoke of in Matthew 7:13-14.
So no, it is not mentioned in the Bible.
As well as this book from the Christian Classics Ethereal Library.