"...For a throne is established by righteousness." Proverbs 16.12In other words, it is through obedience to the Word of God that salvation is conquered.
One thing is to conquer salvation, another thing is to remain saved. The greatest difficulty is to maintain what you conquer, especially salvation. That is why Jesus said, "If anyone wants to follow Me, let him deny himself, take up his cross and follow Me." Not only for a few days, but every day. Follow Him every day to remain saved, and establish the throne of eternal life.