"In all cases where incidental powers are acted upon, the principal and incidental ought to be congenial with each other, and partake of a common nature. The incidental power ought to be strictly subordinate and limited to the end proposed to be obtained by the specified power. In other words, under the name of accomplishing one object which is specified, the power implied ought not to be made to embrace other objects, which are not specified in the constitution."

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I don't need to praise anything so justly famous as Frost's observation of and empathy with everything in Nature from a hornet to a hillside; and he has observed his own nature, one person's random or consequential chains of thoughts and feelings and perceptions, quite as well. (And this person, in the poems, is not the "alienated artist" cut off from everybody who isn't, yum-yum, another alienated artist; he is someone like normal people only more so - a normal person in the less common and more important sense of normal.)

— Randall Jarrell