Have you always believed you can lose your salvation; or is that something you learned to believe at some later point?
From I've truly known God, I've believed that we can lose our salvation. If we turn from him and don't live by his will, then yes we can.
Jesus himself said that if we do this, then we are in danger of being told to depart from him being workers of iniquity. And Paul said that God would give us over to our reprobate minds if we carry on wilfully going against God, Paul even said to do such things is worthy of death (spiritual death not natural death) I know that I can't take God for granted and I know that I can't mock God. And I certainly know that I can't expect God just to say, oh that's ok it doesn't matter what you do/did, even going against me your saved anyway! No way, Paul says that we are judged on what we do whether it be good or bad, and Jesus said in revelation that we are judged on our works. God doesn't change Danoh, and right through the Bible we are taught to turn from sin, the apostles also taught this, as seen here in Hebrews 10
Hebrews 10
And let us consider one another to provoke unto love and to good works: Not forsaking the assembling of ourselves together, as the manner of some is; but exhorting one another: and so much the more, as ye see the day approaching.
For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins, But a certain fearful looking for of judgment and fiery indignation, which shall devour the adversaries.
He that despised Moses' law died without mercy under two or three witnesses: Of how much sorer punishment, suppose ye, shall he be thought worthy, who hath trodden under foot the Son of God, and hath counted the blood of the covenant, wherewith he was sanctified, an unholy thing,
and hath done despite unto the Spirit of grace?
For we know him that hath said, Vengeance belongeth unto me, I will recompense, saith the Lord. And again, The Lord shall judge HIS people. It is a fearful thing to fall into the hands of the living God.
Those who are in the body of Christ are God's people, and God will judge us, if we carry on wilfully sinning and disobeying God once we know the truth, as to do this is to put our own lives before God denying the truth and treading all over our Lord Jesus Christ by denying him to live through us. Because if we carry on wilfully sinning and living against the will of God then we are crucifying Christ afresh, putting him to death within our hearts instead of denying ourselves and letting him live through us. God wants our hearts cleansed and he wants to see his sons life in us, he doesn't want to see us live to please our flesh and deny him! If we are born of God, then we should be turning from sin and obeying him, and living a life to please him. If we truly love God from the depths of our hearts, we will want to do his will.
I read Ezekiel 18 KJV last night, if you get a chance to give it a read, then you will see that God certainly doesn't want us to carry on wilfully sinning. And he says so right through the Bible, in both old and new testaments.
I know that we are to turn from sin from the depths of my heart, because i know that the Spirit of God is guiding me through my conscience to do so every day!