We must not think that our time has passed. As long as we are here, there will always be something to learn and much to do.

This phrase brings us back to the fundamental value of Lifelong Purpose.
We live in a youth-obsessed culture that treats aging as a decline rather than a culmination. We are often told that after a certain age—or after a certain failure—our "best days are behind us." We talk about retirement as if it were the end of usefulness. But this quote offers a powerful counter-narrative: usefulness is not determined by the calendar, but by your pulse. If you are breathing, your mission is not finished.
Here is why your time is never "up" as long as you are alive:
The Infinite Classroom: The quote emphasizes that there is "always something to learn." Science (neuroplasticity) proves that the brain can create new connections until the very end. The moment you decide you know everything, you begin to age. The moment you decide to learn something new—a language, a technology, a hobby—you trigger a rebirth.
Experience is a Resource: The world is full of energy but lacking in wisdom. Those who feel their time has "passed" are often the ones sitting on a goldmine of experience that the younger generation desperately needs. You are not obsolete; you are a library.
Presence is Evidence: There is a spiritual pragmatism here: If the universe kept you here today, it is because there is a task that only you can do today. It might be to mentor someone, to comfort a friend, or simply to witness the beauty of the world. Your existence is proof of your purpose.
The golden rule: "You don't stop playing because you grow old; you grow old because you stop playing."
Life is not a career that you retire from. It is a journey that only ends when the heart stops beating. Until then, you are an active participant.
As C.S. Lewis famously said: "You are never too old to set another goal or to dream a new dream."