How can I curse whom God has not cursed? How can I denounce whom the LORD has not denounced? Numbers 23:8 (ESV)
God is the sovereign king of the universe, his decrees stand and his will is accomplished, mans words are impotent and without any real power unless empowered by God. This is why we pray in line with Gods word and declare his word because our own words have no power but Gods words and thoughts are powerful and effective achieving God’s desired ends. see Isaiah 55:11
For there is no enchantment against Jacob, no divination against Israel; now it shall be said of Jacob and Israel, ‘What has God wrought!’ Numbers 23:23 (ESV)
Because as it says in verse 19 God is not a liar and brings his word to pass we can be confident just like Israel that no witchcraft can work on us because God has decreed that we will be blessed and not cursed in Christ. See Colossians 3:3
Flee from sexual immorality. Every other sin a person commits is outside the body, but the sexually immoral person sins against his own body. 1 Corinthians 6:18 (ESV)
This should go without saying but must be said because of the deceptive allure of sexual sin.
Sexual sin is different to other sins because it makes those involved joined in a spiritual way and breaks union with Christ, it destroys relationship, warps God given sex into a tool of the enemy and warps the mind and spirit of those involved, not to mention the offence this causes the Holy Spirit, the destruction it causes in families and society and the sexually transmitted diseases that can be contracted.
Paul makes clear here and in the next chapter that God intends dignity and honour for us and so Sex is a gift within the commitment and sanctification of marriage only… this flies in the face of everything our culture thinks about sex.
(but if she does, she should remain unmarried or else be reconciled to her husband), and the husband should not divorce his wife. 1 Corinthians 7:11 (ESV)
Our culture seems to treat marriage like a temporary item of clothing that is put on and then thrown off when another shirt becomes fashionable, this attitude is one of the reasons the divorce rates are so high. Strictly, married Christian couples should never get divorced.