Māvamaññetha pāpassa, “Na mantaṃ āgamissati.”
Udabindunipātena, udakumbhopi pūrati.
Bālo pūrati pāpassa, thokaṃ thokampi ācinaṃ.

Think not lightly of evil, saying, “It will not come to me.”
Drop by drop is the water pot filled.
Likewise, the fool, gathering it little by little,
fills oneself with evil.

Dhammapada 9.121
The Dhammapada: The Buddha’s Path of Wisdom, translated from Pāli by Acharya Buddharakkhita