Distance makes the heart grow fonder. Familiarity breeds contempt. Too much of anything is bad. Variations on the same theme.
That if you see something often enough, or maybe experience the same thing too much, it loses value.
The converse being, if something is rare, it should be treasured. That the lesser a thing happens, the more you appreciate it when it does. That the very virtue of its rarity, its uniqueness, makes it special, worth remembering, worth holding on to. That the less something happens, anything at all, the more it means.
But then, does repetition really take away from the beauty or intensity of a feeling? Does seeing something, saying something, experiencing something many times, really take away from how much it means? A sunset doesn't become less pretty if you see it every day. The stars are still mesmerising even if you see them every night. Gratitude when expressed often only makes one happier. Smiling a lot never hurt anyone and no one says that it reduces the light in one's eyes just because it's done too often. Love doesn't really become worthless because you express it a lot. A sweet gesture that makes someone's day better doesn't mean that the rarer it is, the better.
Because I repeat myself a lot. And I say the same thing a lot. And I feel the same things a lot. And I express the same things a lot, maybe in different ways.
But I don't think any of that decreases the intensity with which I feel those things or how much I mean them when I express them.
At least, I don't think it does.