When sin has deadened the moral perceptions, the wrongdoer does not discern the defects of his character nor realize the enormity of the evil he has committed; and unless he yields to the convicting power of the Holy Spirit he remains in partial blindness to his sin. His confessions are not sincere and in earnest. To every acknowledgment of his guilt he adds an apology in excuse of his course, declaring that if it had not been for certain circumstances he would not have done this or that for which he is reproved.

Go on to The spirit of self justification for sin originated with Satan...

White, Ellen Gould: Steps to Christ. Pacific Press Publishing Association, 1892; SC 40.1