Koti Taanu Kedodalde Vananella Kedasthu

Literal meaning - "The monkey not only spoils itself, it also spoils the entire forest".

This is used whenever one is found influencing his or her way on others. Especially if the influence happens to be a negative one. For example, if someone passes on a cigarette to his/her friend and encourages smoking, this quotation can be used to describe the situation.