Diligence should be practiced in four areas - in abandoning bodily, verbal, and mental misconduct, and wrong view.
Appamāda sutta - Diligence
"Bhikkhus, diligence should be practiced in four areas. What four?
1 Abandon bodily misconduct and develop good bodily conduct; do not be negligent in this.
2 Abandon verbal misconduct and develop good verbal conduct; do not be negligent in this.
3 Abandon mental misconduct and develop good mental conduct; do not be negligent in this.
4 Abandon wrong view and develop right view; do not be negligent in this.
Bhikkhus, when a bhikkhu has abandoned wrong bodily conduct and cultivated good bodily conduct, abandoned wrong verbal conduct and cultivated good verbal conduct, abandoned wrong mental conduct and cultivated good mental conduct, abandoned wrong view and cultivated right view, he need not fear death or what comes after death."