Attracting Positive Or Negative Energy

I've heard people saying that "We must think the worst of anything so that if it doesn't materialise, we won't get hurt. But I totally disagree with those people who think it that way. Why these people are wasting time on thinking negatively? They are not aware, that, subconsciously they are attracting negative energy and attracting negative things to happen in their life. If they are thinking of negative result about their plan or project, negative things are bound to happen. They will face losses. We are attracting negative energy and the result is negative. Instead of putting so much effort by thinking the worst, one must start thinking positive about it that whatever we are doing will give fruitful results. By doing this we are attracting positive energy and we will find that whatever we wanted has been manifested. So, be very positive.