Of each sad word which is more sorrowful

Of each sad word which is more sorrowful,
“Sorrow” or “Disappointment”? I have heard
Subtle inflections baffling subtlest rule,
Of each sad word.

Sorrow can mourn: and lo! a mourning bird
Sings sweetly to sweet echoes of its dule,
While silent disappointment broods unstirred.

Yet both nurse hope, where Penitence keeps school
Who makes fools wise and saints of them that erred:
Wise men shape stepping stone, or curb, or tool,
Of each sad word.