Whatever infiltrates and gets through to our hearts comes out of our mouths, and manifests in our actions. Whether silly, good, bad, toxic, or otherwise, what is on the inside controls what happens on the outside.
That's why we need to fill ourselves with things that build us up; encourage; strengthen; motivate; and improve us. We should internalize and meditate on great and excellent things, which will in turn produce great and excellent results in our lives.
Strive to think great thoughts.