It is easy enough to be pleasant,
When life flows by like a song,
But the man worth while is one who will smile,
When everything goes dead wrong.

Ella Wheeler Wilcox (1850-1919) American author, poet, temperance advocate, spiritualist

Poem (1892), “Worth While,” st. 1, An Erring Woman’s Love
    (Source)

Sometimes called "The Man Worth While." Collected again in Poems of Cheer (1910).