A lucky man is rarer than a white crow. [ Juvenal ]

Wit is to be met with everywhere, but wisdom is a rarity. [ Proverb ]

Few and precious are the words which the lips of Wisdom utter,
To what shall their rarity be likened?
What price shall count their worth?
Perfect and much to be desired, and giving joy with riches,
No lovely thing on earth can picture all their beauty. [ Tupper ]

It would be a rarity worth seeing could any one show us such a thing as a perfectly reconciled enemy. [ South ]

To be able simply to say of a man he has character, is not only saying much of him, but extolling him; for this is a rarity which excites respect and wonder. [ Johann Wolfgang von Goethe ]

Rarity gives a charm: thus early fruits are most esteemed; thus winter roses obtain a higher price; thus coyness sets off an extravagant mistress; a door ever open attracts no young suitor. [ Martial ]

If refined sense, and exalted sense, be not so useful as commonsense, their rarity, their novelty, and the nobleness of their objects, make some compensation, and render them the admiration of mankind. [ Hume ]