The most important poem I have ever read is Carrion Comfort by Gerard Manley Hopkins. I turn to it often for comfort. But I must quickly add that it is not a greeting card message or saccharine rhyme. It may take some soul searching to discover that despair can be felt as a kind of sickening comfort to wallow in, and that we must find reasons not to do so.
The poem can be read and heard here: https://www.poetryfoundation.org/poems/44392/carrion-comfort
Hopkins was a priest and his work is both lofty and profound. I have recently re-posted a helpful analysis (Carrion Comfort: Hopkins Wrestles with God) by a contemporary poet (Hokku).
The poem ends with one of the most enlightened devices imaginable. For those who do not think it blasphemy to say “My God,” after reading this poem you will always say it twice from now on: The first time as a secular expression of shock, and the second as a sacred expression of awe.
In the audio clip below you will hear why the poem is so important to me, as I explain it to my daughter.