How does light break through?

How do thoughts of good break through the dark thoughts? Do you fight with depression, fears, doubts, stress? Is it close to despair? Please find someone who cares and tell them your thoughts. It is said that darkness or blackness is the absence of light, so can we dispel the gloomy thoughts by having one good thought, which then shines and lights up the dark? And for the light to keep shining do we not just need to have one positive thought after another? It sounds simpler then it is but before you get discouraged and say “It won’t work”, give it an honest effort!!