The best that Gauss has given us was likewise an exclusive production. If he had not created his geometry of surfaces, which served Riemann as a basis, it is scarcely conceivable that anyone else would have discovered it. I do not hesitate to confess that to a certain extent a similar pleasure may be found by absorbing ourselves in questions of pure geometry.
And when it has got in; as one not finding what it seeks, whatever that may be, it wails and howls to issue forth again: and not content with stalking through the aisles, and gliding round and round the pillars, and tempting the deep organ, soars up to the roof, and strives to rend the rafters: then flings itself despairingly upon the stones below, and passes, muttering, into the vaults.
Time is one thing that can never be retrieved. One may lose and regain friends. One may lose and regain money. Opportunity, once spurned, may come again. But the hours that are lost in idleness can never be brought back to be used in gainful pursuits
I must reject fluids and ethers of all kinds, magnetical, electrical, and universal, to whatever quintessential thinness they may be treble distilled, and as it were super-substantiated.