Every vessel, every container will only pour out what is contained in it, and that's very obvious.
And, so your tongue is your ability to express what lies in your spirit. Television, movies, the friends you hang out with, the music you listen to -- everything around you [are] environmental forces that shape how your being is and how your heart is. And when you open your mouth to speak, it's like your heart is like a sponge that absorbs all of this material from around you.
Essentially, what you're doing is squeezing what is in you, and what comes out is going to be what has been compiled in your mind and in your memory. Obviously, you can only express in your heart, what has been placed in it. And so in order for the outcome and the output from the tongue to be positive, the input in that needs to be positive in spirit, in silence, in talking, and throughout our lives.