 The third key difference of the law of attraction and the law of assumption is the belief. Now the law of attraction teaches that the belief and positivity that we output and that we see the world having will come back to us. Essentially that having a positive outlook on life and on other people and ourselves will bring our manifestation back to us because we are vibrating at a higher level thus attracting those things to us. Now the law of assumption is more like okay we change our belief about something.