Even as it's only 3 lines, it's so beautiful <3 It sounds like something a mother would tell her child every night~ to never give up and always follow their dreams even when it might be hard. Though, I may be looking too far into this It's lovely, I adore this.
the way i interpreted it is even though you (general) may be going through a rough time (darkness), it will eventually get better (shine brighter). others may see it differently e.g. quite literally by what it says