If a person needs a reward to be good, they aren't good. 

A good person would continue to be good even after being told they would be excluded from heaven.

Why do we die?  Because all have come short of the glory of God.  We inherited death because of Adam's sin.  We are born with a sinful nature.   We can read the Bible but we cannot do what it says.  We will fail.  We cannot produce genuine love and compassion on our own.   We are selfish and greedy from birth, because we are separated from God.  But if we desire to stop sinning, and confess that our sins are wrong, and seek God with all our heart. . .He will be found.  And after we accept Jesus as the Christ, truly, we are adopted into the family of God.  God will send His promised Spirit--which lives inside every believer.  With His Spirit we are able to put to death our sinful nature.  Thus we no longer live, but Christ lives in us.  What other god offers this?   We are then true children of God--we are one with the same Spirit, Jew and Gentile alike.  And we are reconciled to God.  Through Adam all die, and through Christ all live.  Only by Christ can we stand before God holy and blameless in His sight.  We can be perfected through Christ.  We are able to overcome the sins which once enslaved us.  We are free!   Through faith we are justified, not by works.  Anyone can do good deeds that are external.  (Where others can see)  But no man is good, not a single one.  The only good one is God alone.  Yet we shouldn't be discouraged--by believing in the Lord Jesus we can receive a likeness of God.  We will come across many trials in this life, and the sinful nature will war against the Spirit.  If we do not give up we shall reap a harvest, for surely those who persevere will come out refined as gold, is God's arm too short to save them?  Will He not help those who seek Him and love Him?  He is good, one must not doubt His unfailing love.  Those who give in to their sinful pleasures (and do not return) did not really know Him.  For if they did. . . they would not leave Him.   The intimacy God gives you is so beautiful and pure, no seduction the world has to offer will ever come close.  Do not let anyone else teach you.  The Bible is the Word of God, and it is perfect in every sense.

Jesus said, "I am the way, the truth, and the life. No one comes to the Father except through Me" (John14:6). It is also written, that there is none who does good, no, not one.  Mankind is spiritually dead and in need of life. God's love for you is so great that Jesus came to save you and to give you spiritual life. Romans tells us that the wages of sin is death. Jesus took all your sins and the sins of the entire world upon Himself at the cross (forgave every one of them, once for all, never to remember them again [Heb 10:17]).  Your sins have been taken away, forgiven by God. Jesus said from the cross, "It is Finished!" (John 19:30). Then, Jesus was raised from the dead on the third day and the same life that raised Him from the dead will also raise all those who believe in Christ and have faith in what Christ did for us through His death, burial and resurrection (Col 2:13-14; Rom 5:10; Rom 6:10).  Jesus tells us in John 16:8-9, there is only one sin left in the world today.  This sin cannot be forgiven because it must be repented of... "the sin, because they do not believe in Me."  Jesus said, "I am the resurrection and the Life..." "...I have come to give you life..."  "I am the way, the truth and the Life...." "I am the bread of Life."

My standard of truth comes from God Himself through His Holy Bible.  John 3:18 tells you in no uncertain terms, who will make it to heaven and who will not.  What standard of truth do you use?