Maybe he is a patient in a psychiatric ward

Just kidding, so no offence is to be taken. Whatever his case might be, it is definitely not his, or anyone else's for that matter, mistake or fault for lacking required patience or being greedy beyond limits. We are all greedy and impatient in specific circumstances and under certain conditions, and that's totally normal if you ask me. However, if this is not what you really want, which is evidently the case here, attacking or confronting the problem head on (like practicing more self-discipline) will ultimately turn out an exercise in futility since all it takes is just one relapse and then you are instantly back to square one. How such issues should be dealt with, I described earlier in the thread