Worthy Words. Words that honor His name.
The story is told of John Bunyan, author of Pilgrim's Progress, who said it was "hearing a group of women talk about the things of God and the work of God in their hearts," which brought about his own conversion. Bunyan certainly "took notes" of their words and then acted on what he heard.
Matthew 12:34 says , "For out of the overflow of the heart, the mouth speaks."
A good choice, to fill one's heart with good things because one never knows who might listening.