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Albert Einstein, he of Relativity theory, once said: “Everything should be made as simple as possible, but no simpler.”

All things in life, whether mental or material, must be optimally kept at an enough level:

• Need means something indispensable.
• Enough means no residual and no shortage.
• Excess means something must be removed.
• Shortage means something must be added.
• Biggest means there is nothing else besides it
• Smallest means there is nothing else inside it.