An attempt at visualizing the Fourth Dimension: Take a point, stretch it into a line, curl it into a circle, twist it into a sphere, and punch through the sphere.
Albert Einstein (1879-1955) German-Swiss-U.S. scientist.
Surely there is grandeur in knowing that in the realm of thought, at least, you are without a chain; that you have the right to explore all heights and depth; that there are no walls nor fences, nor prohibited places, nor sacred corners in all the vast expanse of thought...
Robert Green Ingersoll (1833-1899) American politician and orator.
Nimble thought can jump both sea and land.
William Shakespeare (1564-1616) British poet and playwright.