Do not take a small sin lightly; instead, think about Who it is that you are disobeying. You are disobeying the Almighty Lord Who sometimes punishes people for small sins, and sometimes pardons people for great sins.
Think about every action that you commit. Do not belittle any sin as advised by Sufyan al-Thawri, Allah can punish for small sins and forgive for major sins. Think about it!