I don't think we can assume but we can assure if we will be following the God's command to us, repent our sins and be like Jesus Christ. If we do what it takes and start now, then God will see it. We still have chances, that is the bible is trying to tell us. We just need to follow God's rule and do not attempt to sin again. However, since we are only human, we are prone to making mistakes. Once we make a mistakes we just need to ask forgiveness from God. Pray to him to save our souls because we want to go to heaven. If you are a sinner and you are not doing anything about it, then you can assume where your souls is going, but that is not what God want us to think. He wants us to be with him and he want us to receive his gift to us and that is eternal life.