The bible says that Jesus had rather you not sin, but if you do you have an advocate with the father, which is Jesus Christ the righteous. You can be forgiven for making a mistake or sinning, the bible says all manner of sins can be forgiven accept blasphemy against the Holy Ghost. This scripture is to someone who has come to the knowledge of the truth, which is Jesus died for our sins, and through him we have life. yet reject the truth and go about their lives never accepting Jesus for remission of their sins, they therefor have no more sacrifice, as there is only one way to Heaven. and they have rejected that path.