The reason for the faith is that there is no greater pleasure than to be rewarded with the revelation of Godliness and the instilling of the Shechina [Divinity].
In order for one to receive all this for the purpose of bestowal, there is a correction of concealment, where he engages in Torah and Mitzvot [commandments] even though he feels no pleasure. This is called “not in order to receive reward.” When he has this Kli [vessel], his eyes soon open to welcome the face of the Creator.
When a desire awakens within him, that it is worthwhile to serve the Creator for the pleasure, he soon falls into concealment. This is regarded as death, meaning that previously, he was adhered to life, and he was rewarded with it only through the power of faith. Therefore, now that he is corrected and begins to work in faith once more, he receives back his breath of life. At that time, he says, “I thank You for returning my soul with compassion.”
This is precisely when he assumes once more the work in the manner of faith above reason. When he had the concealment, he says, “Great is Your faith.” The faith is so great that through it, he receives the soul once more.