Being watchful of the sins you commit
Anas (radi Allahu anhu) said: You indulge in (bad) actions which are more insignificant to you than a hair while we considered them at the time of Messenger of Allah (sal Allahu alaihi wa sallam) to be great destroying sins”
The less fear of Allah, one has the more disobedient he becomes to Him. As the fear of Allah decreases, one becomes more bold in committing sins. As the Companions of the Prophet (sal Allahu alaihi wa sallam) were intensely fearful of Allah, they were afraid of committing even very minor sins.
And Allah Knows Best!