To use the same words is not a sufficient guarantee of understanding; one must use the same words for the same genus of inward experience; ultimately one must have one's experiences in common. Friedrich Nietzsche
Another world exists that I must experience. A genus of people exists who I must meet. I must inhale the air they breathe--share their world at all costs. Hideo Kojima
Producer's Surplus is a convenient name for the genus of which the rent of land is the leading species. Alfred Marshall