@Ralph, It depends about what you thought first of all and then the idea you've left with. I believe that until the phase "keep doing" you're already near to the success and your idea was the correct one. Otherwise, you've chosen a bad idea or you didn't spend a good effort for making it alive. Other thing, jumping from one idea to another one is like groping into the darkness :)

@Ralph - Great lecture, Professor! I wrote down it in my notebook. :)

Ralph, Green Silly (not Sly :D) Fox want to than you for good, helpful and hopeful words :)

Green Sly Fox - I guess my advice (although I don't like to give advice because too often it is taken the wrong way - better to give your opinion and others can choose to accept it or not ......) Anyway my opinion is that you need to be honest with yourself. The more you know yourself you will know if you are making progress, however it is that you judge that be in monetary terms, in terms of influence, in terms of becoming famous, in terms of respect, in terms of getting closer to a truth that you are searching for, or in terms of feeling that you are making progress - even if it is at a snail's pace. Only you can be the judge of the level of satisfaction that you wish to attain - but for goodness sake be honest with yourself.

Eagle, I see you still don't understand the diference between optimist and presistent ;)