Rari nantes in gurgite vasto=--Swimming one here and another there in the vast abyss.
Apparent rari nantes in gurgite vasto=--A few are seen swimming here and there in the vast abyss.
According to a newspaper report of 1716, there also should exist an edition which begins: Quamvis omnium hominem intersit nosse veritatem, rari tamen boni illi qui eam norunt, etc.
That this catalogue should be very numerous, neither you nor your readers ought to expect: rari quippe boni; "the good are few.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "rari" in a variety of sentences. We hope that you will now be able to make sentences using this word.