But this man, after he had offered one sacrifice for sins for ever, sat down on the right hand of God; from henceforth expecting till his enemies be made his footstool. For by one offering he hath perfected for ever them that are sanctified. – Hebrews 10:12-14
Truly we can rest assured in our salvation. It is Jesus’ death on the cross that paid for our sins and not any work that we have done. If we have believed on the Son of God for salvation then in Christ we are secure because He rose from the dead and is now on the right hand of God.
I am also thankful that by this same sacrifice I have been perfected before God. My salvation and sanctification is not dependent upon me or what I do. The entire work of salvation is a work of God and he is the one that perfects us by His death on the cross. We can rest in God because He has finished the work and by His offering we are perfected before God. Truly there is no boasting but in Jesus Christ our Saviour.