Authors:

The action required to sustain human life is primarily intellectual; everything man needs has to be discovered by his mind and produced by his effort.

Ayn Rand, Nathaniel Branden, Alan Greenspan, Robert Hessen (1986). “Capitalism: The Unknown Ideal”, p.15, Penguin
The action required to sustain human life is primarily intellectual; everything man needs has to be discovered by his mind and produced by his effort.