It is only" he that repenteth and forsaketh his sin that shall find mercy." That does not mean forsaking it for a day or any period of time, and then resuming it again, but forsaking it finally.
Now, let us see what is meant by the term "forgiveness." Webster says: "Forgiveness, the pardon of an offender by which he is considered and treated as not guilty. Forgive: To pardon; to remit as an offence or debt; to overlook an offence and treat the offender as not guilty. The original and proper phrase is to forgive the offence, to send it away, to reject it, that is, not to impute it to the offender. But by an easy transition we also use the phrase to forgive the person offending."
Under the word pardon we find the definition," remitting an offence or crime; absolving from punishment."