What is the main reason that get you to decide to leave the work?

A man take honest and leave Money, But when Compairing Honest and life, he leaves honest but save life. So do not Leave the job up to the end of life. It means there is no reason of leaving the job untill it's your desire.

Getting a better opportunity is the only reason for a wise man to leave his current job whereas fools got alot of reasons. 

well, there are many reasons

1-you found a new job with a better salary that you dream to get

2-you trying to develop you exprience in your employment

3-maybe you have healthy reasons to leave it so you can't countinue anymore

4-you are ready now to have your own company to get independant

Better opportunity and good package is the maqin reason, but sometime no proper coordination with your boss also leads to leave the job.

In my opinion it should be only when you find a better opportunity otherwise one should try to stick at his work......otherwise one should try to work at his best levels in bad consitions too.

if something happen that harm my diginity

When u feel that you are not giving your best to company.....

Bad Behavior