My friend Shuli Kleinman posted this important idea a while back, and I've remembered it to share now:
"...the darkness can be turned into light, but not by investing talent and goals to it. Darkness becomes light when the mask over the light is taken off, meaning that there is an inherent understanding of the falsehood of the darkness and that appealing to the light behind it will lift us out of it."
And my friends at Breslove of Charleston posted the following, which fits together with Shuli's quote above, in my own nderstanding and life experience:
"Rabbi Nachman teaches, The places that seem lowest of all and furthest from God actually contain the most exalted life force of all, albeit concealed: namely the "secrets of Torah".
"One who has fallen very far should therefore understand that in the very place in which he finds himself he can still draw close to God because of the exalted life force that is concealed there. When he succeeds in returning to God, exalted levels of Torah will be revealed through him. These are the "secrets of Torah". From Likutey Moharan I, 56
How to turn darkness into light, in my experience, is to trust God in every situation and believe we are capable and able to reveal Torah wherever we may be situated.