If I could be saved and then by some act lose my salvation:
It would mean that I have no assurance. I could never be certain of salvation.
It would mean that I have no forgiveness. The Bible clearly teaches that Christ died for my sins. If I can lose my salvation, it must mean that there are some sins in my life for which He has not died. Clearly, no one is forgiven!
It would mean that I am not saved by faith alone. The Bible proves over and over that salvation is by faith alone, apart from any human works. Ephesians 2:8-9 say, “For by grace you have been saved through faith, and that not of yourselves; it is the gift of God, not of works so no one could boast.” To imply that salvation is maintained by good works is to add works to salvation and then it cannot be by faith alone. Good works are not the root of salvation, they are the fruit of salvation.
It would mean that God’s power is limited. John 10:28 says, “And I give them eternal life, and they shall never perish; neither shall anyone snatch them out of My hand.” If we could lose our salvation, then God is not strong enough to keep us saved! Believers do not hold on to God. In Jesus, He holds on to them.
It would mean that our focus is not on Christ. As long as I worry about whether I can lose my salvation or not, my focus is on me and my behavior and not on Christ and His redemptive finished work on the cross.