The most glorious moments in your life are not the so-called days of success, but rather those days when out of dejection and despair you feel rise in you a challenge to life, and the promise of future accomplishments.

This quote means that the most meaningful experiences in life are not when you achieve major successes, but when you are feeling very down but find the strength and motivation to keep going. Those moments show you your resilience and give you the hope that in the future you can do more great things.