It is your mind that matters ...

It is your mind that matters economically, as much or more than your mouth or hands. In the long run, the most important economic effect of population size and growth is the contribution of additional people to our stock of useful knowledge. And this contribution is large enough in the long run to overcome all the costs of population growth.
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 Julian Simon

Quotes from the same author

Friedrich Hayek, who died on March 23, 1992 at age 92, was arguably the greatest social scientist of the twentieth century. By the time of his death, his fundamental way of thought had supplanted the system of John Maynard Keynes - his chief intellectual rival of the century - in the battle since the 1930s for the minds of economists and the policies of governments.
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 Julian Simon
The essence of wealth is the capacity to control the forces of nature, and the extent of wealth depends upon the level of technology and the ability to create new knowledge.
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 Julian Simon
There is only one important resource which has shown a trend of increasing scarcity rather than increasing abundance. That resource is the most important of all—human beings. . . . [An] increase in the price of peoples’ services is a clear indication that people are becoming more scarce even though there are more of us.
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 Julian Simon
The most important benefit of population size and growth is the increase it brings to the stock of useful knowledge. Minds matter economically as much as, or more than, hands or mouths.
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 Julian Simon
Based on first-hand evidence of your own senses - the improved health and later ages at which acquaintances die nowadays as compared with the past; the material goods that we now possess; the speed at which information, entertainment, and we ourselves move freely throughout the world - it seems to me that a person must be literally deaf and blind not to perceive that humanity is in a much better state than ever before.
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 Julian Simon