Keep your mind busy with positive thoughts, actions, and conversation. You won't have the time to let negativity sleep in (Nicole Acker 2012).
Yes we are human and we can sometimes think of rubbish in our own individual minds. We think about how to build mansion within days when we have no cool money in our pocket. We think about how to have all the ladies around us. And we think about how to get that beautiful babe we met somewhere sometime ago on our beds. A lot of rubbish goes through our minds every day.