if a person does good, then evil can be done to him, but without fanaticism, if a person does evil, he will be answered as a hundredfold evil. an evil person can be found more evil, a cunning one - more cunning, good ... there is no more kindness, but in any case, if someone will do evil for good, in the end he is in for a problem, this is bad for the soul and karma
Fullmetal