Quote (Buddha Shakyamuni) 

From The Sutra of the Wise and the Foolish

Do not disregard small misdeeds,
Thinking they are harmless,
Because even tiny sparks of flame,
Can set fire to a mountain of hay.

Do not disregard small positive acts,
Thinking they are without benefit,
Because even tiny drops of water,
Will eventually fill a large container.

Buddha Shakyamuni, Sutra of the Wise and the Foolish, excerpt