What does the Bible say about being a true believer?

A true believer is one who, according to Hebrews 11:1, has faith that is the substance of things hoped for and the evidence of things not seen. This faith is not about tangible actions or feelings but rests entirely on Christ's finished work. To be a true believer, one must recognize that salvation comes through faith alone, a gift from God, not derived from personal achievements or adherence to the law. Confidence and assurance stem from believing in the promises of God, especially what Christ accomplished on the cross.