A little leaven leavens the whole lump.
Men, in their property, are afraid of conflagrations and lightning strokes; but if they were building a wharf in Panama, a million madrepores, so small that only the microscope could detect them, would begin to bore the piles down under the water. There would be neither noise nor foam; but in a little while, if a child did but touch the post, over it would fall as if a saw had cut it through. Now men think, with regard to their conduct, that if they were to lift themselves up gigantically and commit some crashing sin, they should never he able to hold up their heads; but they will harbour in their souls little sins, which are piercing and eating them away to inevitable ruin.
(H. W. Beecher.)
Parallel VersesKJV: A little leaven leaveneth the whole lump.