Some beautiful naseehah from Sufyaan Ath-Thawree (Rahimahullaah)

..... and though it is true that one can repent from sin, avoiding a sin is much easier than trying to sincerely repent from a sin. Verily Allah is oft-forgiving and Merciful to people who perpertrate sins and He is Merciful,Forbearing and Beneficient to those who repent. BEWARE of this ;that the more Forebearing He becomes towards you the bolder you become in disobeying Him.

Do not take a small sin lightly instead think about who it is you are disobeying, an Almighty Lord who sometimes punishes people for small sins and sometimes pardons people for great sins.

The most sagacious of the sagacious ones is he who enters Paradise because of a sin he has perpetrated:He places his sin before his eyes continuing to be constantly afraid for himself on account of that sin until he departs from this world and enters Paradise. The most foolish of the foolish is he who enters the Hellfire on account of a single good deed he performed :he places it before his eyes constantly remembering it and hoping to be rewarded for it and in the meanwhile,he takes sin lightly;and he continues to remain upon that condition until he departs from this world and enters the hellfire.

When you are with people smile frequently and maintain a cheerful countenance but when you are alone cry frequently and be in a state of grief and sadness on account of your sins for it has been conveyed to us and Allah knows best that,on the day of resurrection the most things that a believer will find in his book of good deeds are the grief and the sadness that he felt in this world on account of his sins.