In Matthew 15, Jesus says:

Do not ye yet understand, that whatsoever entereth in at the mouth goeth into the belly, and is cast out into the draught?

But those things which proceed out of the mouth come forth from the heart.
(Matt. 15:17-18)

What shape is your heart in?

How have you been talking?

Have you been talking faith, or have you been talking doubt?

Have you been talking love, or have you been talking in a way that the love of God can't work?

Those things which proceed out of the mouth come forth from the heart; and they defile the man. For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies: These are the things which defile a man: but to eat with unwashed hands defileth not a man. Then Jesus went thence, and departed into the coasts of Tyre and Sidon.
(Matt. 15:18-21)

It's not what you eat that defiles you, but what you say.

It's what comes out your mouth that causes all the trouble in your life and discourages you from receiving from Almighty God.

Source: How To Get Your Prayers Answered by Norval Hayes
Excerpt permission granted by Harrison House Publishers