No More Learning

Once again,
If thou suppose           thou beholdest,
Among all visible objects, cannot be,
Unless thou feign bodies of matter endowed
With a like nature,--by thy vain device
For thee will perish all the germs of things:
'Twill come to pass they'll laugh aloud, like men,
Shaken asunder by a spasm of mirth,
Or moisten with salty tear-drops cheeks and chins.