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"Dear Princess Celestia,
Today I learned that even the most mundane objects can take on a new life for a pony as mementos. These little things, like a photo, a kazoo, or the shell from a dragon egg, can become tiny monuments to the past. They help us remember things that we would otherwise forget. With them, the little, happy moments in our lives that we shared with friends and family live on. With them, we can be reminded of the bad memories we should never forget.
These little things, these trinkets, become precious to us, more valuable than gold or gemstones. They let us remember. We can even share our memories with other ponies and grow new and stronger friendships.
Your Faithful Student,
"...P.S. And sometimes, Princess, the most difficult but rewarding thing you can do is pass your treasures on to somepony else. Then, not only do you form a greater bond of friendship with that other pony, but your memento has a chance of becoming something important to them too."