I’ve heard people say they were sure they’d go to heaven simply because they were good people. They didn’t hate anyone, they helped others, they didn’t kill or cheat. They insist that their good things far outweigh the “occasional” bad things. They are absolutely sure that God wouldn’t send them to hell.
The Bible says, “For it is by grace you have been saved through faith, and this not from yourselves; it is the gift of God, not by works, so that no one can boast. Ephesians 2:8-10 says, we have been saved to do good works. Good works do not save us. Unless you believe in the death and resurrection of Jesus, washed in His blood and accept the free gift of salvation, you can never have eternal life.