1 Thes 4:2-5
For ye know what commandments we gave you by the Lord Jesus.
For this is the will of God, even your sanctification, that ye should abstain from fornication: that every one of you should know how to possess his vessel in sanctification and honour;
Not in the lust of concupiscence, even as the Gentiles which know not God.
If you are a Christian and someone won’t honour your decision to keep God’s will in abstaining from sexual relations outside of marriage then you need to let that person go. God didn’t send them. Walking outside the will of God is a very dangerous thing. Blessings come as a result of obedience.
As children of God we should strive to grow and become more and more like Christ. Though the Spirit of God dwells in the believer and carries out various functions in our lives as Christians, the believer can quench the Holy Spirit through disobedience to God’s word and refusing to walk in his will. Every Christian needs to understand the battle between their flesh and its sinful desires and the Spirit within them. The flesh is the reason why believers, although saved, still struggle with sin. The flesh, being our old man, is enmity against God, it is not subject to the law of God and neither can be. So those that are in the flesh can never please God (Romans 8:7-8).
This is why Christians are commanded:
Walk in the Spirit, and ye shall not fulfill the lusts of the flesh.
For the flesh lusteth against the Spirit, and the Spirit against the flesh: and these are contrary the one to the other: so that ye cannot do the things that ye would.
It continues on in Vs 18 to list the works of flesh, one of these works being fornication.
The Christian desires to follow God and obey him because upon believing in Christ, his spirit is regenerate, it is no longer contrary to God but his flesh still is. The level of obedience a Christian has towards God is determined by how much he chooses to walk in the Spirit and die to his flesh and its sinful desires daily.
I find then a law, that, when I would do good, evil is present with me. For I delight in the law of God after the inward man: but I see another law in my members, warring against the law of my mind, and bringing me into captivity to the law of sin which is in my members.
O wretched man that I am! who shall deliver me from this body of death?
I thank God through Jesus Christ our Lord. So then with the mind I myself serve the law of God; but with the flesh the law of sin. (Romans 7:21-25)
Always remember that you can always receive God’s forgiveness for your sins and if you have not made the decision to become a believer in Christ and receive his salvation and grab hold of all the promises in God’s word for those that come to him you can always do so.
Behold, now is the accepted time; behold, now is the day of salvation (2 Cor 6:2b)