What does man love more than life? Fear more than death or mortal strife. What poor have, the rich require, and what contented men desire, what the miser spends and the spendthrift saves and all men carry to their graves?

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The answer to this riddle is "Nothing." It is a philosophical riddle that explores the concept of desire and contentment. The riddle suggests that man loves nothing more than life, fears nothing more than death, and desires nothing more than contentment. Additionally, it highlights the paradox that both the poor and rich require nothing, as well as the idea that nothing accompanies every individual to their grave.

To arrive at the answer, one must carefully analyze each line of the riddle. By identifying the contrasting elements presented in the lines, such as life versus death, poor versus rich, and miser versus spendthrift, we can infer that the answer revolves around the absence or lack of something, which is represented by "nothing" in this case.