What is "if--"

"If—" is a poem by British Nobel laureate Rudyard Kipling, written in 1895 and first published in Rewards and Fairies, 1910. It is a tribute to Leander Starr Jameson. The poem is written in the form of paternal advice to the poet's son, John. As poetry, "If—" is a literary example of Victorian-era stoicism.