Date: 1779, 1781

"Truth indeed is always truth, and reason is always reason; they have an intrinsick and unalterable value, and constitute that intellectual gold which defies destruction: but gold may be so concealed in baser matter that only a chymist can recover it; sense may be so hidden in unrefined and plebe...

— Johnson, Samuel (1709-1784)

Date: 1796

"He who feels the spirit in him, will be conscious of possessing the pearl of great price, and will lock it up in the sanctuary of his heart, as his richest treasure, never to be despoiled of it by the seducing arts of false philosophy; never to exchange that pure gold, which is the same yesterda...

— Anonymous

Date: 1922

"When the two gases previously mentioned are mixed in the presence of a filament of platinum, they form sulphurous acid. This combination takes place only if the platinum is present; nevertheless the newly formed acid contains no trace of platinum, and the platinum itself is apparently unaffected...

— Eliot, T. S. (1888-1965)