In John 15:4-6 Jesus exhorts His disciples, “Abide in Me, and I in you. … If anyone does not abide in Me, he is cast out as a branch and is withered; and they gather them and throw them into the fire, and they are burned.”  Every promise of salvation in the scripture has a condition that must be fulfilled. If we sin and are genuinely sorry and repentant there is an abundance of forgiveness in Jesus. However, if we repeatedly yield to the same temptation a hardening sets in. We are not as sorry as when we first fell in this sin and become more and more hardened and finally end up with “an evil heart of unbelief.” We depart from the living God. We put ourselves outside of His hand and therefore, lose our salvation. Read more from the article “Once saved, always saved?” here.
Jesus does speak about one sin that is unforgivable. “Therefore I say to you, every sin and every blasphemy will be forgiven men, but the blasphemy against the Spirit will not be forgiven men.” Matthew 12:31. The Holy Spirit is also called the Spirit of truth (John 16:7-13). He points out to you the truth about yourself – your sin, and what you need to do about it. Blaspheming against the Holy Spirit in this present time means that you have repeatedly and deliberately hardened your heart against the truth and continue in unbelief. There is no forgiveness for a person who dies in unbelief, having continually rejected the promptings of the Holy Spirit. That is unforgivable blasphemy. But as long as you feel God working in and calling you, there is still hope for you. Read more from the article “Have I gone too far for forgiveness?” here.
Blessed are the poor in Spirit, theirs is the Kingdom of God.”  Matthew 5:3. God looks for those who sorrow over their lack of goodness, wisdom, patience and purity.  It is these whom God can help. The poor in spirit long to be like Him, and it is exactly these people who are well-pleasing to Him. They give their hearts completely to finding and obeying God’s will. Read more from the article “What do I have to do to be good enough for God?” here.
Being baptized does not free us from temptations or bring us the salvation that the Scriptures speak about. Rather, baptism is affirmation of our desire and resolve to follow Jesus on this inner way. Even though the Bible stresses the importance of baptism for a wholehearted disciple, it is not required for salvation. Read more about baptism here.
Yes! The Bible clearly tells us that in the New Covenant it is completely possible to be free from sin—not only manifest, outward sinful actions, but the very root of sin that I have inherited and which dwells in my human nature. “For to this you were called, because Christ also suffered for us, leaving us an example, that you should follow His steps: “‘Who committed no sin, nor was deceit found in His mouth.’”  1 Peter 2:21-22. Read more about overcoming sin here.
When a person is converted and becomes a Christian, they get a new mind. The old mind was to serve themselves and their lusts—the new mind is to serve God and do what pleases Him. If a person turns back to the old mind, loving this world and enjoying their lusts, then they lose their salvation. Such a mind does not fit into the kingdom of heaven. Read more from the article “Can a Christian lose salvation?” here.