How we think and speak does affect our lives. What we think gets in our heart and Jesus said, out of the abundance of the heart the mouth speaks (Matthew 12:34)
Psalms 19:14 Let the words of my mouth, and the meditation of my heart, be acceptable in thy sight, O LORD, my strength, and my redeemer.
We have a choice what to say. There is power in your words. So choose to say what is good, what agrees with God's Word, and what brings blessings.
Proverbs 18:20 A man's belly shall be satisfied with the fruit of his mouth; and with the increase of his lips shall he be filled. 21Death and life are in the power of the tongue: and they that love it shall eat the fruit thereof.
Proverbs 13:2A man shall eat good by the fruit of his mouth: but the soul of the transgressors shall eat violence.
Prov. 21:23Whoso keepeth his mouth and his tongue keepeth his soul from troubles.
Psalm 34:12What man is he that desireth life, and loveth many days, that he may see good? 13Keep thy tongue from evil, and thy lips from speaking guile. 14Depart from evil, and do good; seek peace, and pursue it
Proverbs 10:11The mouth of a righteous man is a well of life: but violence covereth the mouth of the wicked.
When we pray what God says in His Word or speak in agreement with it, He says the angels hear us voice His Word and begin to work on our behalf. They listen for His Word to be spoken
Hebrews 1:14Are they not all ministering spirits, sent forth to minister for them who shall be heirs of salvation?
Psalm 103:20Bless the LORD, ye his angels, that excel in strength, that do his commandments, hearkening unto the voice of his word.
But if we speak the opposite of God’s Word the angels cannot respond for they will only do God’s will.
Prov. 6:2Thou art snared with the words of thy mouth, thou art taken with the words of thy mouth.
Isaiah 55:11So shall my word be that goeth forth out of my mouth: it shall not return unto me void, but it shall accomplish that which I please, and it shall prosper in the thing whereto I sent it.
What you say causes defeat or brings victory so don’t limit God through your words
Psalm 141:3Set a watch, O LORD, before my mouth; keep the door of my lips.
Matt 12:36-37 But I say unto you, That every idle word that men shall speak, they shall give account thereof in the day of judgment.
Deuteronomy. 30; 19 I call heaven and earth to record this day against you, that I have set before you life and death, blessing and cursing: therefore choose life, that both thou and thy seed may live