Think lightly not of evil,
‘It will not come to me’,
for by the falling of water drops
a water jar is filled.
The fool with evil fills himself,
he soaks up little by little.
~Dhammapada

Explanation: Some tend to believe that evil can be taken lightly. There attitude to wrong-doing is that they can get away with anything whatsoever. They say in effect: “I will behave in the way I want. Evil results will never come my way.” But evil accumulates little by little – very much like a water-pot being filled drop by drop. Little by little the evil accumulates, until he is filled with it. Link source