When i lose money i don't quit because i just paid for my lesson.
Having lost a lot of money on several occasions i find myself not losing as much anymore and i am more careful and can spot things i didn't consider looking at before.
I think with more getting my hands on i will become more experienced and finally Expert so I can help or give advice to other people.
I don't think a loss should make someone quit, it can only make someone wiser, including stepping back, taking it easy, investing more to lower the average cost, etc.