Both Keats and Longfellow's poems are about unfulfilled desires and the ever-present idea that death is coming. Later on in both poems, their views shift slightly on the matter of life and what needs to come out of it. Longfellow's view on life stays grim and depressing throughout his poem, whereas Keats wants to see all that life has to offer but is daunted by the fear of death and not accomplishing that which wants.
The most similar part of the poems was in the beginnings of them, both start grim and depressing as they express their disdain towards eventual death. Keat's, "I may cease to be," parallels Longfellow's, "Half of my life is gone," by both expressing their common belief that they may stop living at any point. The similarities between the poems extend to Longfellow saying, "gone, and I have let/
The years slip from me and have not fulfilled/ The aspiration of my youth," and Keats' ominous use of the word "before," implying that there is still so much that he has not done that he wishes to do.
The middle part of both of poems is where Longfellow and Keats start to differentiate their points. Keats starts sharing his desire for romance in line 5, "When I behold, upon the night’s starr’d face,/
Huge cloudy symbols of a high romance," to convey his desire for romance before his passing. In contrast, Longfellow says, "But sorrow, and a care that almost killed,/ Kept me from what I may accomplish yet." Longfellow's views are much grimmer and he believes that overwhelming sorrow and dismay is enough to keep him from acting on his desires. Between the two poems, Longfellow is much more depressing and believes that his desires are not able to be pursued because it is all futile, whereas Keats believes that his desire is enough to keep wishing for it and striving for it.
When I Have Fears and
Mezzo Cammin both conclude in a scenic way, hence making them similar on the surface, but different once you read a little beneath the surface. "Then on the shore/ Of the wide world I stand alone, and think/ Till love and fame to nothingness do sink," the conclusion of Keats' poem uses imagery to paint this picture of a man standing and looking out onto the world and reflecting his life. Keats shares his view on his past, and how it was filled with more important ideas, other than if you completed a desire or not. In sharp contrast, Longfellow paints a similar image with a man standing and contemplating his life. " A city in the twilight dim and vast, ....The cataract of Death far thundering from the heights," is Longfellows interpretation of a man looking back at his life. The city is a metaphor for his life- vast and dim, filled with missed opportunities and a sorrowful outlook. The real contrast between Keats' and Longfellow's poems is that Longfellow ends his poem with the cry of death, as to say there is no point because all is futile in the end.