161. The evil done by oneself, self-begotten, self-bred, crushes the foolish, as a diamond breaks a precious stone.
162. He whose wickedness is very great brings himself down to that state where his enemy wishes him to be, as a creeper does with the tree which it surrounds.
163. Bad deeds, and deeds hurtful to ourselves, are easy to do; what is beneficial and good, that is very difficult to do.
DHAMMAPADA, Chapter 12. Self