Answer: The meaning of the metaphor in this line is the first days of spring are the best days.
Step-by-step explanation:
"Nothing Gold Can Stay" demonstrates bravery by concluding that nothing in this world is ever permanent. Everything we are introduced to is transient and has the ability to change, demonstrating that there are no truly permanent things in this world.
There is nothing that has the quality of permanence, whether it be happiness or despair. Everyone on earth must accept the fact that everything in this planet is mortal and that this is a fact.