What the meaning of the word "is" is

It depends upon what the meaning of the word "is" is - Bill Clinton

Says Dean Sluyter in the Zen Commandments: "Time is of the essence - the essence of our sense of being a limited, wavelike identity defined by specific traits, rather than limitless ocean." He believes that when you use words to categorize people you are "using the present tense to blur past behavior into an illusion of solid, continuous, once-and-future reality. "