Longfellow states this clearly when he writes, "And the grave is not its goal." Meaning that, life doesn't end for people simply because they die; there is always something more to be hopeful and optimistic for. Longfellow begins discussing how humans must live their lives in constant anticipation for the next day under the belief that it will be better than each day before it: "But to act that each to-morrow / Find us farther than to-day."
The form of the poem is very basic. Each stanza is four lines long, making the poem a quatrain, and the rhyme scheme follows the pattern "ABAB, CDCD, EFEF..." etc. for each of the nine stanzas. Each stanza also has a recurrent rhythm pattern: 8 syllables, 7 syllables, 8 syllables, 7 syllables.
He believes that people should lead heroic and courageous lives and not sit idle and remain ineffectual while the world rapidly changes around them: "Be not like dumb, driven cattle! Be a hero in the strife!" His use of the word "strife" is especially interesting, since it clearly acknowledges that life is inherently difficult, is a constant struggle, and will never be easy. Longfellow then encourages everyone to have faith and trust the lord and not to rely on an unknown future to be stable and supportive.
He advises people to seize the moments they have before them and act while thinking about their present situations. Longfellow continues