How can we be sure that we are saved according to the Bible?

Assurance of salvation is rooted in the sovereign work of God within a believer's life. The scripture highlights that we are saved by grace through faith, which is itself a gift from God—not a result of our own efforts (Ephesians 2:8-9). This underscores the belief that true faith and the ability to accept God's grace are given by Him, eliminating any ground for boasting. When a person recognizes their spiritual deadness and receives faith as a gift, they see that their salvation is entirely due to God's initiative. This truth brings comfort and security, as God's purposes cannot fail, and He will not lose any of those whom He has chosen and called.