Can you lose your salvation over wilful ongoing sin?

Title: Can You Lose Your Salvation Over Willful Ongoing Sin? Scripture (referenced): Hebrews 10:26; Hebrews 6:4–5 Scripture (inferred): Hebrews 10:10–14; John 6:37; Ephesians 1:13–14; John 10:27–29; Romans 8:38–39 Themes: perseverance and salvation; finished work of Christ; knowledge vs faith; old covenant vs new covenant; sufficiency of Christ’s sacrifice; assurance of salvation Keywords: Hebrews 10:26; Hebrews 6; salvation; willful sin; apostasy; finished work; sacrifice; covenant; assurance; faith; Levitical system; Christ alone