In life, is very necessary for one to know when to start, quit, and give a try to what they are doing. Not everything that needs one to call it a quit actually, there are things to try much harder on, not by quitting.
I expect one to quit something that they are doing when they know that is no longer being of help to them but it keeps taking much of their time and money and there tends to be no solution coming forward on how it will improve their life and lifestyle.
Before quitting, you need to observe two things,
firstly, am I the one being lazy, not wise or irresponsible,
secondly, is the work not profitable enough or is it not helpful again.
After the observation and you find out where the problems comes from then you will decide whether to work harder or quit if the job doesn't worth it. But you can't just quit without trying your luck and see if the job will be beneficial to you again. Quitting is not always the best option/solution to the problems you are facing in your work, investment or business, you need to put more effort and see where it will take you to. don't quit just because you are feeling that you can find another work, or invest in another business or something, because you already know the challenges you are facing with your present work or business, but you don't have any idea about the new investment you want to involve yourself in. Wise man said "the devil you've known is better than the angle you've not meet".So we need be careful and thoughtful when making the decisions of our lives. you can quit if the work is frustrating and not helpful anymore, you don't need to exhaust your energy and drained yourself on something that is not beneficial to you.