He sings how his will and strength have been toughened by everything that's happened ("test fate", "pressed with that weight", etc.). He cannot be controlled, he can't even be held in check - that is his strength. However, even then; he knows that eventually his time will come ("off with his head") and he may even be actively waiting for that day ("I chase the sun"). Until then, he will keep moving forward ... when his 'day is done' (i.e.: the light finally does come).
He sings how his will and strength have been toughened by everything that's happened ("test fate", "pressed with that weight", etc.). He cannot be controlled, he can't even be held in check - that is his strength. However, even then; he knows that eventually his time will come ("off with his head") and he may even be actively waiting for that day ("I chase the sun"). Until then, he will keep moving forward ... when his 'day is done' (i.e.: the light finally does come).