Once I saw a chemist take a pinch of powder 
Simple dust it seemed and half-unstop a phial: 
Out dropped harmless dew. " Mixed nothings make" quoth he 
"Something!" So they did: a thunderclap, but louder 
Lightning-flash, but fiercer put spectators' nerves to trial: 
Sure enough, we learned what was, imagined what might be. 

Had I no experience how a lip's mere tremble, 
Look's half hesitation, cheek's just change of color, 
These effect a heartquake, how should I conceive 
What a heaven there may be ? Let it but resemble 
Earth myself have known ! No bliss that' s finer, fuller, 
Only bliss that lasts, they say, and fain would I believe.