The lessons of science should be experimental also. The sight of a planet through a telescope is worth all the course on astronomy; the shock of the electric spark in the elbow outvalues all theories; the taste of the nitrous oxide, the firing of an artificial volcano, are better than volumes of chemistry.
Natural science sharpens the discrimination. There is no false logic in nature. All its properties are permanent: the acids and metals never lie; their yea is yea, their nay, nay. They are newly discovered but not new.
Do not be caught by the sensational in nature, as a coarse red-faced sunset, a garrulous waterfall, or a fifteen thousand foot mountain... avoid prettiness - the word looks much like pettiness - and there is but little difference between them.
Great is the art,
Great be the manners, of the bard.
He shall not his brain encumber
With the coil of rhythm and number;
But, leaving rule and pale forethought,
He shall aye climb
For his rhyme.
"Pass in, pass in," the angels say