Sometimes you come in contact with a rarity,
A person.
A person who you know is genuinely good.
There is no single feature that points out their goodness.
No deep look in the eyes,
No single way that their hair falls.
You just take in the whole of a certain person and know that they are good.
Talking to this rarity is only a conformation of what you already know:
This person is good.
This person is special,
and you'll remember them forever.