It is believed that when you think negatively, you emit negative energy to the universe and the universe multiplies that energy into a number of small atoms which gets bombarded back to you.At the same time when you think positively the absorption and emission power of the universe gets multiplied by 10 times and the retaliation power is not only sent to you but to the people surrounding meaning your closed ones. Hence always have a positive attitude, be optimistic and keep this theory in mind!!