The proverb actually wants to tell us that no matter how hard is to study and learn every day , when you'll be done with studying you will start realize that all the time you spent learning , doing homeworks , studying till 5am in the morning, the sun that comes after the rain is actually your future, your familiy , and your job after a long long session with all these books and notebooks that you've written and read.
Daca am gresit ceva scuzama..