Even in the lowest of levels, the Infinite Light of Hashem shines, and anyone who wants to attach himself to the Creator can do so from wherever he is. Regarding this, it is stated: “Fortunate is the man who doesn’t forget You, and the person who strengthens himself in You” (Musaf of Rosh Hashana), because it takes great effort and chizuk. And anyone who is in an extremely low place must exert himself even more, since even in the deepest darkness, in the shadow of death, he can draw upon himself the Infinite Light by closing his eyes and giving himself over to Hashem for just a moment. About this the verse says: “Even as I walk in the valley of the shadow of death, I fear no evil, because You are with me” (Tehillim 23:4), and as it is written: “If I sit in darkness, Hashem is my light” (Michah 7:8).
(Likutei Halachos, Netilas Yadayim 4)