Wrapping My Head Around Solipsism I think, therefore I am proves that your thoughts exist, and nothing more. However, it does not prove that other things don't exist. I think you can reasonably rely on being accurate about certain emotions that you experience, even though emotions fluctuate. For example, if you feel happy, it is not possible to refute the quality of that experience, even if it is only for a moment, and later you feel a different emotion. Moreover, the "I" in I think, therefore I am" needs to be defined. Is it all of your thoughts, or only the thoughts you find agreeable. For example, if you experience a surprising piano falling on your head, and you question whether you imagined that or not, at some point it becomes evident that you did not "will" that to happen, and yet you experienced it. I think we can say that something other than "yourself" actually caused an object, that is not you to hit you. or something other than yourself caused you to have an illusion of being hit. At this point we can even begin to separate thoughts coming from the unconscious mind from thoughts coming from the conscious mind and going the step further and saying that only your conscious mind is "you" and thoughts that you expectantly and undesirably experience from time to time originate from some place other than you.