Hebrews 3:13

But continually encourage one another everyday, as long as it is called “Today” (and there is an opportunity), so that none of you will be hardened (into settled rebellion) by the deceitfulness of sin (its cleverness, delusive glamour, and sophistication).

We all need encouragement from fellow believers, whether it is by fellowship, bible study, devotions. The encouragement helps us stay away from the sin that is less than God’s best.  The heart hardens as it turns from God justifying sin.  However, when we encourage each other in love, sin then holds no appeal.