Where is the (approximate) quote “the darkest time… before dawn”?

The approximate quote "the darkest time... before dawn" can be found in the poem “Invictus” by William Ernest Henley. The poem was written in 1875 and is about facing life’s struggles with courage and determination. The full quote is “In the fell clutch of circumstance/I have not winced nor cried aloud./Under the bludgeonings of chance/My head is bloody, but unbowed./Beyond this place of wrath and tears/Looms but the Horror of the shade,/And yet the menace of the years/Finds, and shall find, me unafraid./It matters not how strait the gate,/How charged with punishments the scroll./I am the master of my fate:/I am the captain of my soul.” The quote “the darkest time... before dawn” can be found in the fourth stanza of the poem, which reads, “The path of duty is the way to glory:/I thank whatever gods may be/For my unconquerable soul./In the fell clutch of circumstance/I have not winced nor cried aloud./Under the bludgeonings of chance/My head is bloody, but unbowed./Beyond this place of wrath and tears/Looms but the Horror of the shade,/And yet the menace of the years/Finds, and shall find, me unafraid./It is the darkest hour of night/Just before the break of dawn/But I shall face the fear of fight/And I shall keep going on.”