From Rabbi Zoe Klein:
My favorite line of prayer in the Siddur is from lecha dodi (from the Friday night liturgy welcoming the Sabbath bride), where it reads, Hitor'ri, hitor'ri, ki va oreich, kumi ori, uri uri shir dabeiri... [Awake, awake, your light has come! Arise, shine, awake and sing...] At night, with darkness descending, it is often hard to muster the energy it takes to hope, and yet it is precisely at this time when we sing out, "Arise and shine, your light has come!" To me, this is the light of hope and of God's love. When I sing this ling of lecha dodi, I feel embraced and loved, even as the hour grows darker and darker.
On this and all nights, may your darkness be filled with the light of hope.