The book of proverbs says:
For a man shall eat good by the fruit of his mouth. A man shall be satisfied with good by the fruit of his mouth and the recompense of a man's hand shall be rendered in to him a man's belly shall be satisfied with the fruit of his mouth and with the increase of his lips, shall he be filled, for death and life are in the power of the tongue and they that love it shall eat the fruit thereof
Proverbs 2:13, 12 vs 14, 18 vs 20- 21
ORIGINAL KING JAMES VERSION
Speak only positive things and positive things will be yours, speak negative things and that is what you will see.
Don't speak what you feel or what you see in your environment into your life, only speak God's word into your life. God's word should be the standard of your speaking and meditation.
If you want increase, speak increase into your life, if you want children speak forth children into your life. If you want marriage, speak forth marriage into your life. If you want academic success, success in your business, success in your career, speak them forth into your life.
Don't speak things of the world into your life. Don't speak negative things into your life. Don't alllow negative thoughts in your mind. Don't allow negativity of the world build up in your mind and then bring forth negative speech from your mouth.
See, think and speak only positive words. Speak grace filled words and it shall be well with you.
Remember, don't say what you don't want to see. Your mouth is your life. Speak only your expectation and it shall be well with you.