If you can speak what you will never hear, if you can write what you will never read, you have done rare things.
Henry David Thoreau

A garden is a complex of aesthetic and plastic intentions; and the plant is, to a landscape artist, not only a plant - rare, unusual, ordinary or doomed to disappearance - but it is also a color, a shape, a volume or an arabesque in itself.
Roberto Burle Marx

Each contact with a human being is so rare, so precious, one should preserve it.
Anais Nin

Human beings are accustomed to think of intellect as the power of having and controlling ideas and of ability to learn as synonymous with ability to have ideas. But learning by having ideas is really one of the rare and isolated events in nature.
Edward Thorndike