From the Bible:

Gospel of St. Matthew, Chapter 15:

Then some of the scribes and Pharisees from Jerusalem came and asked Jesus, “Why do your disciples break our ancient tradition and eat their food without washing their hands properly first?”

Jesus, after scolding them for their hypocrisy in observing lesser rules so carefully while ignoring the much more important ones, said,

“Listen, and understand this thoroughly! It is not what goes into a man’s mouth that makes him common or unclean. It is what comes out of a man’s mouth that makes him unclean.”

From the Bhagavad Gita, second Chapter:

The intellects of those who lack fixity of spiritual purpose are inconstant, their interests endlessly ramified.