Do you ever wonder how people come up with some of the doctrine taught today? One doctrine that has always been dumbfounding is the doctrine of "Once saved, always saved!" Years ago there was a couple I was studying with. The lady believed in this doctrine. When she was converted to Christ she revealed it was always a great doctrine to believe in and follow because she could do as she pleased (and she did) and couldn't ever be lost! There was no fear of God before her eyes. There was no trembling at His word. Just a life of fun and frolicking in sin and in the end you're saved. Today that lady is so grateful to the saving grace of Jesus because of her unbelief in ignorance.
Too many believe that one cannot fall from grace. I have some books written by scholarly minds but believe in the doctrine that one cannot fall from grace. No one takes into account that the majority of the nation of Israel was lost because of sin. I know that's Old Testament but it shows that just because one belongs at one time doesn't mean they are a shoe-in! What about Judas? A hand-picked apostle of Jesus Christ yet the best he offered was 30 silver coins rattling in his pocket and later in the temple and suicide! And what of Demas? Paul said he loved the present world too much and deserted him (II Tim. 4:10). When you read the book of Hebrews it is completely devoted to warning against leaving Jesus. Those Hebrew Christian's weren't "once saved always saved." What all this means is one can't be protected from themselves in spite of themselves! One can come but they can also go. Christianity is a life, not a one time happening.
Walking in the Light is just that...a life lived in the Light. To say one has fellowship with the Lord and walk in sin, they lie and do not practice the truth (I John 1:6-7). The Galatian congregations were warned that those who turn back to the law for their justification are severed from Christ, fallen from grace (Gal. 5:4). People don't fall from works or law. They fall from GRACE!
Fear the Lord! Hold fast to the name of Jesus! Humbly walk with the Lord with a whole heart trusting in His grace. And His grace will lead us home!