Определение и Значение "the darkest hour is just before the dawn"

What is the origin of the proverb "the darkest hour is just before the dawn" and when to use it?

The origin of the proverb "the darkest hour is just before the dawn" is often attributed to Thomas Fuller, an English historian and theologian, in the 17th century. The saying suggests that even in the most challenging or difficult times, there is often hope that things will improve, and the worst moments can signal that a positive change or breakthrough is near. It encourages perseverance, reminding individuals that struggles or hardships are often temporary, and better times may follow if one can endure through adversity.