A NARROW window may let in the light,"A Narrow Window" by Florence Earle Coates. Published in The Unconquered Air (1912) and Poems (1916) Volume II.
A tiny star dispel the gloom of night,
A little deed a mighty wrong set right.
A rose, abloom, may make a desert fair,
A single cloud may darken all the air,
A spark may kindle ruin and despair.
A smile, and there may be an end to strife;
A look of love, and Hate may sheathe the knife
A word—ah, it may be a word of life!